"Relax, Candace. It's simple math. Instead of cooking it at 350 degrees for one hour, we could cook it for five minutes at... (enters equation into calculator) 9000 degrees! What could go wrong?!"
—Stacy, "Moon Farm", Phineas and Ferbnote The surface of the Sun is 9,940.73 degrees Fahrenheit, by the way.
Whenever someone is strapped for time and needs to cook something, they will assume that the time and temperature listed in the recipe are inversely proportional; logic a Straw Vulcan would be proud of.
For example, they'll assume a cake that needs 30 minutes at 375 Fahrenheit to bake can be baked just as well in 15 minutes at 750 degrees (never mind that a normal kitchen oven won't go that high). Expect there to be flames, plenty of smoke, and for the Lethal Chef to pull out something resembling a forest fire from the oven. Or occasionally, a fireball that destroys the entire house, with a perfectly baked pie in the middle of the debris.
Various examples show the oven dial go up to thousands of degrees. One has to wonder why the oven had a dial that could go up that high if it wasn't meant to be used that way. (Why not?)
Hilarity Ensues. A subset of the horrible cooking skills of a Lethal Chef. This has probably been Truth in Television for some of us at one point in our lives. Also, notice that some processes do behave according to Oven Logic; milk pasteurization, for example, can be done in 5 minutes at 70°C, or in less than 3 seconds at 150°C — though again, the reduction in time is disproportionate to the increase in temperature (and doing it faster kills the taste by caramelizing the milk sugar).
The problem is that cooking (and chemistry) follow their own rules, which the character is not privy to - more specifically, there are several factors to the equation that the "cook" in question fails to consider beyond simply the amount of heat transferred. The rate of heat transfer is not proportional to the temperature of the oven, but to the difference between the temperatures of the oven and the food. Since the temperature of the food changes over time, you'd need to have a firm grasp of differential equations to be able to predict the time required at higher temperatures. That's not even counting the effect on chemical kinetics, which will greatly increase the rate of reactions such as oxidation (burning) at high temperatures* The general rule of thumb is that every 10°C increase around room temperature roughly doubles the rate. Of course, household temperature scales are also not based around absolute zero like the Kelvin scale is. After all, what exactly would be twice as hot as 100°F or 100°C?* It's 659.67°F and 473.15°C; you need to convert to Rankine(°F+459.67) and Kelvin(°C+273.15) before doubling.
This trope is also a type of Logical Fallacy. Not (directly) related to Fridge Logic. The more extreme cases will require our chef to use Tim Taylor Technology. See also Mismeasurement, contrast Instant Roast.
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Lethal Chef Akane Tendo in Ranma ½ had forgotten the boiled eggs, so she thought she could have them up in "a jiffy" by popping the entire carton of eggs into the microwave. It exploded spectacularly.
In Episode 29 of Cardcaptor Sakura, Meiling Li did this, hoping to have a cake done before Syaoran came home from school (she wanted to show him that she could make a cake for their school's Home-Ec class). Needless to say...
Millie. You know that "exploding kitchen, perfect pie" analogy? The one used in the summary at the top of this page? She does this every time she cooks.
Satoshi in Michiko to Hatchin applies Oven Logic to medication. He takes double the amount of pills recommended dose for adults, figuring it would double effectiveness.
A version of this occurs in Iron Wok Jan. Jan is a skilled chef, but because he was raised alone by his grandfather, he has no idea how to cook for more than five people. When he starts working at the Gobancho restaurant, he tries to cook vegetables for fifty people by taking the recipes his grandfather taught him and multiplying all of the quantities of food by ten. The end result is deemed a failure. He realizes his mistake later: all of the additional vegetables add too much water and make the dish too juicy.
A variant appears in the episode "Toys in the Attic" of Cowboy Bebop, where Spike's impatience leads to him trying to use some kind of flamethrower-like tool to cook kebabs more quickly. The results are charred, inedible messes.
Freaks' Squeele: Chance's solution to cooking two brands of pasta together is to average the cooking times. The result: a big heap of al dente pasta in mush. Not exactly disastrous, but it does put everyone off dinner. (Except Ombre.)
In an ad for M&Ms with a cookie recipe, the red and yellow M&Ms remind the consumer not to try this — the red one holding up burnt-looking cookies and mentioning "500 degrees for 20 minutes", while the yellow one, looking rather singed, says, "And definitelydon't try 1000 degreesfor 10 minutes!"
An inversion, of sorts, appears in the movie The Accidental Tourist. Attempting to make sure the Thanksgiving turkey isn't too dry, the sister of the protagonist sets the temperature in the oven too low (140 degrees Fahrenheit! also known as 60 degrees Celsius), and just cooks it much, much longer. Of course, a turkey sitting out overnight at a temperature that could be found in Death Valley turns it into a teeming mound of botulism; the one person bold enough to eat the food (the sister's suitor) ends up being carted off to the hospital.
In the 1997 theatrical movie of Bean the two main characters attempt to pull of this trope when a pair of important guests drop by, both of them having completely forgotten about the appointment. Strapped for time and without having anything else to serve up, they decide to prepare a turkey dinner (which the non-Cloud Cuckoo Lander of them notes would take about 5 hours to prepare) by stuffing it into the microwave and trying to do the job in about 15 minutes. The result is predictable.
God of Cookery gets away with this because both participants in a cooking contest are using chi blasts to speed their cooking.
In Bridget Jones' Diary, Bridget decides to make a caramelised oranges dish the night before, but needs to go to bed, so she reverses this idea, putting it on a lower temperature for a longer time. She ends up with something that looks like the picture in the book, if a bit darker. Her guests are prompted to ask "What is this Hon? Is it Marmalade?"
Inverted, in a way, in P. G. Wodehouse's Love Among the Chickens. Ukridge, in an attempt to save money, attempts to incubate chicken eggs at a lower temperature for a longer time. Predictably, it fails.
A tie-in Red Dwarf 'official log' contained a recipe for a curry that is supposed to be left to stand overnight and slow-cooked for some hours before eating. Lister annotates it thus: "Smeg that! Life's too short. Bung it in the microwave for five minutes on Thermo-Nuclear; that's what it's for." Of course, given that he'd already upped the spice content by a couple of orders of magnitude it couldn't have made things much worse by that point.
In Grimble by Clement Freud, a recipe tells Grimble to boil a potato for 20 minutes. He cuts it into sixteenths and boils them for a minute and a quarter.
Employed by Katie in The Girl With The Silver Eyes when she realizes that she's late putting the meat-loaf into the stove, so she moves the temperature from 350 to 500 to compensate and burns it. In her defense, she's 9.
Family Matters did it. Laura and Steve were partnered together in a home-ec class, and she tried to speed-bake a cake by doubling the heat. Hilarity ensued.
The Man's Kitchen (video link) in one show of Home Improvement had an over-the-top microwave (or as they called it, a "macrowave") that worked on this principle. It emits so much radiation that you cannot operate it without wearing lead vests.
This happened on an episode of Pee-Wee's Playhouse. They were baking bread, and one of the puppets turned the oven up all the way to 700.
The older brother on Mr. Belvedere did this in one episode. The title character said, "Kevin, I don't mean to be cruel, but this sounds like something your brother would do."
The Mr. Belvedere example had an even better line than the one noted above: he also said "Pity we don't have a kiln; we could have eaten yesterday."
"Instead of Lobster Thermidor we will be having lobster jerkey."
A wonderful episode of Kenan & Kel involved the pair trying to find a Thanksgiving turkey. They finally acquire one but with an hour to go to dinner, elect to place it in a microwave in the oven.
Neelix does this in an episode of Voyager and it works. Further proof that reality does not apply to this series.
He also suggests at one point that if the crew picks up some space-gas he could use it to "get more energy" and improve cooking time. Many jokes have been made about Neelix's cooking both in and out of the show.
One episode of Charles In Charge had a multi-tiered example; Charles and Buddy don't know what temperature to bake the cake at, so Buddy surmises that if a baked potato cooks at 350 degrees, a cake, which is approximately 10 times as big, should cook at 3,000. Since the oven only goes up to 500, they decide to compensate by cooking it for 6 times as long.
Lois and Clark get a few house guests and they need to cook a turkey rather quickly. 300 degrees for a few hours equals a few seconds with Eye Beams. However, Clark was undergoing a Super Power Meltdown at the time, causing the turkey to be burnt, the kitchen to be wrecked.
Parodied in the The Red Green Show, where a microwave is hooked up to a VCR to introduce fast forward (cook something rapidly), rewind (freeze something rapidly), and eject (launches the food product).
On The Bob Newhart Show, when the men are supposed to be cooking the Thanksgiving turkey, they wind up with an abbreviated and alcohol-fueled instance. After doing the math (250 degrees, 4 hours = 1000 degrees, 1 hour) a problem and creative solution are presented:
This oven only goes to 500 degrees.
We'll get two ovens!
A Thanksgiving episode of Good Luck Charlie has Amy turning the turkey fryer Up to Eleven to speed the cooking time. The ensuing explosion launches the turkey into the air and it falls on Teddy. The family ends up eating sandwiches that "may contain turkey" around her hospital bed.
On Peep Show, Jeremy explains how to "trick" the boiler into heating up the flat faster by setting it to a higher temperature than he actually wants, so it'll panic thinking it has a long way to go only to be shut off before it gets there.
In one strip of Beetle Bailey, Cookie is watching a cooking-show on television, sizing up the cake-recipe for camp consumption along the way - that is, multiplying every ingredient by 100. At the end, however, the baking-instructions arrive, and in the final panel, Cookie is seen sitting in front of an oven (with black smoke pouring out of it), declaring "It'll be ready next week."
Calvin and Hobbes once decided that making twenty individual pancakes was too much work, so he just poured in all the batter, so as to make one big pancake and then cut it in half. It should also be noted that when he added the eggs, he didn't bother removing them from their shells.
A traditional Finnish recipe involves one batch of pancake batter simply poured into a pan and baked, then served in slices. Aside from the eggshells, this is actually a perfectly good idea.
An early episode of (I believe) For Better or for Worse applied this logic to clothes washing. If washing a load of clothes with a standard-sized scoop of detergent gets them clean for the next week, so the kids figured, washing them with the whole box of detergent should get them clean for the next few months!
One FoxTrot strip played with this trope, with Jason complaining that the recipe didn't make it clear whether a "350-degree" oven was measured in Fahrenheit, Celsius, or Kelvin. Peter jokingly suggested that maybe they wanted him to rotate the oven just short of a full circle.
The show MA Nswers, a show designed to answer "manly" questions, posed the question "What else [besides an automobile] could you put a HEMI engine into?" Their number 1 answer: a "HEMI grill", which could cook 240 hot dogs in 3 minutes. Whether or not this invokes Oven Logic depends on whether the engine is there to increase the grill temperature or speed up airflow.
Fire trope? Must be time for a Mythbusters item! While examining various extreme ways to pop popcorn, one of the ways tested was explosions. Answer: No. Explosions either fling the unpopped kernels around, burn them or both. They did, however, discover that you could pop popcorn with lasers, one kernel at a time.
Used in an unusual way on Food Network Challenge. When pouring sugar into a cold liquid to create designs, one contestant explained that the sugar (300 degrees in an unspecified scale) and the liquid nitrogen (-300 degrees in an unspecified scale) averaged out in temperature.
The "unspecified scale" was probably Fahrenheit with those figures: liquid nitrogen exists between -320 and -346°F at standard atmospheric pressure, compared with -210 to -196°C and 63 to 77 K. It's also the only one of the three common scales that has a -300.
A slightly different version of faulty cooking logic on an episode of the Funday Pawpet Show as Herbie recounts realizing he had no eggs after having started mixing some brownie batter, so he just added more water since "Eggs are water, right?".
Helix from Freefall takes this to its Logical Extreme: Cooking is fundamentally the application of heat and pressure to food. Doing this faster will logically cook the food faster. What's the fastest way to apply heat and pressure to food? Explosives! Florence explains that you're actually sending massive shockwaves through it, ruining the food.
Sci Fi Debris sums it up in his review of the Voyager episode, "Flashback". "What kind of cook thinks that increased heat equals less cooking time? A bad one!"
One episode of Care Bears had Mr. Beastly watching a cooking show, which at one point directed him to put a bowl of cookie dough in the freezer for 30 minutes — "or the Deep Deep Freeze for 12 seconds!" We never know just how bad Mr. Beastly's oven math is, though, because apparently he fell asleep waiting 12 seconds. When he wakes up, the bowl is encased in a solid block of ice.
Ed, Edd n Eddy had Eddy do this with a microwaveable burrito, five seconds after he'd already delegated the task to The Smart Guy. No burrito merit badge for them.
The Garfield Thanksgiving special had Jon do this with the turkey - 350 degrees for five and a half hours becomes 500 degrees when he only has three hours: "Hmm. Guess I'll have to speed things up a bit. twist twist 500 degrees! That was easy." What's interesting is that this will actually work, if it's done correctly, although it's a little more complicated than simply putting the turkey in oven and cranking the heat up. It's known as "two hour turkey," and the technique is detailed here. (It will not work with a turkey that's still frozen, as Jon's was.)
In a Foster's Home for Imaginary Friends episode in which Madame Foster's cookie recipe becomes a worldwide attraction, Bloo is left to make cookies all by himself. He uses this logic to bake a batch, causing the roof of the house to explode.
Bloo: Okay, this is taking too long. Let's see, if it takes 20 minutes to cook at 250 degrees...it should take 2 minutes at 2500 degrees! (Bloo does ties that causing the roof to explode) Whoops.
Hi Hi Puffy AmiYumi featured the girls in this dilemma, the results looking like a nuclear meltdown had occurred.
A Popeye & Son episode had Popeye and Junior using this logic when Olive wasn't available to cook.
An episode of Hey Arnold! had this used before the thing even went into the oven. Sid manages to mistake tsp for "Ten Square Pounds" instead of "teaspoons". This causes what they were making (an attempt at the world's largest pizza puff) to explode violently.
In an episode of A Pup Named Scooby-Doo Shaggy makes popcorn by putting it in the microwave and setting the temperature to 8 million degrees for one second. It works: His house is instantly filled with popcorn.
A recipe-based variation in Doug: Roger needs eight bananas for banana pudding but only has six, so he comes up with the brilliant idea of subtracting 2 from everything. The resulting goo isn't very appetizing on its own, but it turns out to be fantastic as a pizza topping.
Note that this is almost a valid cooking method: If he really wanted to make a smaller recipe, he could have reduced each ingredient by 1/4 of its original amount. Close, but still so wrong.
Lampshaded to such an extreme that a literal lamp was involved in the Phineas and Ferb episode "Moon Farm." When Ferb relates a recipe for "Lamb Cobbler" to Candace and Stacy through Phineas and Irving from the moon, the only part that correctly gets through the traditional telephone-game messups (i.e. "One pound of lamp") is the cooking time, 350 for 1 hour. With only five minutes to spare, Stacy declares "It's simple math!" and proceeds to cook it at not the mathematically logical 4,200 degrees, but instead 9,000.note The surface of the Sun is 9,940.73 degrees Fahrenheit, by the way.It comes out perfectly, leading Stacy to wonder "How can that be? We didn't even put lamb in it!"
Fridge Brilliance: 350 F = 450 K, multiply by 12 then convert back to F and you have 9256 degrees or so.
"Bad Hair Day" has Candace sitting under a hair restorer after a disastrous attempt at styling her own hair. She's supposed to sit under it for an hour at setting 5. But Jeremy says he's coming over in 20 minutes, so Candace decides that ten seconds on setting 20 will do just as well. After all, "why would they put a setting 20 if they didn't mean for it to be used?"
In the Disney shortMickey's Birthday Party, Minnie's oven goes all the way up to "volcano heat." Goofy uses the setting to speed up baking the cake with explosive results.
The 1987 TV special Blondie and Dagwood, based on the comic strip, had Dagwood attempt this.
In an episode of The Amazing World of Gumball Gumball orders Darwin to bake cookies, and when Darwin's just putting them in the oven Gumball tells him to bake faster, so he turns up the temperature burning the cookies to a crisp.
In the Lalaloopsy episode "A Hobby For Bea", Bea and Crumbs are trying to bake a giant cookie and Bea gets the idea to double the temperature to reduce the baking time. This results in the cookie being burnt on the surface and too hard to eat.
In 2006, a man died in Australia after having received at least 28 "jolts" from taser, at 50000 volts. Channel Nine News reported this as being the equivalent of "over a million volts altogether". Voltage doesn't work that way (not to mention that it's the current that kills).
Forensic scientists are taught to use "Degree hours" when calculating how long a body had been dead, because many of the methods they use to judge this, rigour, decomposition, the speed of development of insect larvae, are temperature dependent. this is basically oven logic, but it works because A, despite what CSI: Crime Scene Investigation teaches everyone, the vast majority of bodies are not frozen by super-intelligent serial killers trying to trick the investigators, nor dumped in Turkish baths for over elaborate reasons and so are usually left at whatever the local air temperature is, and B, calibration curves exist so you can check the local weather reports, and so based on known recent temperatures adjust your time of death accordingly.
If you increase the power output of a microwave, it will take less time to cook something, based on the principle of how they work. However, you only need to worry about this if you're using a commercial microwave (in convenience stores), which are way more powerful than home microwaves; and if used improperly invariably under or over cook one's food.