An episode of MMAPGaming features the host installing a lava pit in his house for disposing of unwanted items. He tears out his wood walls and replaces them with cobblestone so he won't burn his house down, then adds a low ceiling above the pit so he doesn't accidentally wander into it. The material he uses for the ceiling... is wood, because it looks nice with the rest of the house. The episode ends with him nearly losing his voice when the inevitable happens.
While all of these examples are accidental, there are some people who just... like the risk. Two guys decided to buy a wooden house above a surface lava lake, just to see how long it would last before burning down completely. Cue a lot of putting down fires and repairing holes.
Pranks and traps
This prank. One person complains how mining a gold block disconnects him, tricking a server admin straight into a trap.
The absolutely epic Troll Mojang pulled off with the April Fools Day prank; Minecraft 2.0, featuring sensitive chickens that don't like being looked at, Redstone Bugs(literal ones, not glitches), and a stab at the people who want realism in the game via torches not lasting forever. A friendly pink Wither was included that invoked Tastes Like Diabetes and farm animals could be fed until they exploded, getting fatter and fatter as you went on. Sadly, the page containing the download was taken down on April 2nd.
This poor player has a lot of trouble with creepers. It doesn't help that his friends like to disguise themselves as creepers to shock and traumatize him, and just when he thinks he's figured out which is which...
These SMP players tried to grief a griefer by encasing his house in a glass sphere and filling it with lava. Then it began to leak, and what results could be a scene from a typical disaster movie.
"We've created the Sun."
Minecraft hit one million sales. Drunk Notch, karaoke, and a nerf gun followed.
An LPer by the name of bananapielord had uploaded his Minecraft world for his fans to edit as they please, and spent the next few videos showcasing the worlds they sent back. The third world in this video, showcased seven minutes in, has some interesting changes made to his house. Hilarity Ensues when he accidentally sets off a block of TNT.
These two adventurers at the 14:00 point, find out that they don't make it in home in time, so they both build makeshift shelters, leading to a funny Inaction Sequence where they discover that one player lacks cobblestone to smelt glass in a furnace and the other finds out that he lacks sand so he can't make glass either. They find their own solutions to see outside. After a daybreak, they visit each other's "houses".
"Chickens fucking everywhere!". Someone finds out the properties of eggs when thrown at stuff (ie, they can spawn 1-4 chickens), so he and a bunch of friends mess with it, but they soon realise they've woken a sleeping giant here. Eventually the server overloads, especially when he tries something drastic.
This entire video. Filled with plenty of Angrish, pained cries of "WHAT THE FRICK", and failed attempts to ride a minecart, this stream has something for everyone!
Most items that involve the day/night cycle or direction start to bug out when you enter the Nether. However, the silliest case of this would have to be wood-and-wool beds exploding violently when one attempts to use them.
Heck, the entirety of "Enderman Roomate", especially "What the-".
Parts 31, 32, and 33 of his Minecraft videos are a textbook example of From Bad to Worse. in Part 31, Toby drowns in the water near his house when he forgets to surface for air. Then, because his bed was obstructed, he doesn't respawn in his house and has to find where he died, a problem made worse by his No Sense of Direction. In Part 32, Toby is forced to turn the game to peaceful mode as he dives for his items. Having spent half the video looking for his items, he goes off to bed... and dies because it was obstructed, losing his items and being teleported away from his house again. Part 33 is entirely comprised of him trying to find his house.
Someone made fun of the broken base, FOR EVERY UPDATE UP TO THE HALLOWEEN UPDATE! Link: Mojang goes bankrupt.
The 1.1 update added multiple language options. Guess what one of the options is? Pirate!
A chunks error can cause this◊ to happen. That player won't be running out of beef any time soon.
Version 1.2 introduces something that Creepers are afraid of: Cats. No, really. Tame a few and watch Creepers avoid you like the plague.
The code for enchanting, when translated, is completely random and nonsensical. What the nether is "shorten wet beast physical?"
Heck, ANY Game Chap mod review, especially the Herobrine series.
Team Avolition, a griefing team, was challenged to see how much griefing they could perform on the Doridian server before getting caught. Stealing 3,500 diamonds, burning down the fabled city, and annoying the crud out of an admin who has no ban powers are the LEAST of their accomplishments. Doubles as a Crowning Moment of Awesome that they were able to pull this off in the first place.
Their jihad against the Rice-Think server was also glorious. The owner and his moderators started a smear campaign on both their website and Team AVO's forums, claiming that they had "won" and that they would "never be defeated." When their server went public, Team AVO found out that no attempt was made to hide or protect anything of value, and that the server's moderation team had the combined mental acuity of an acorn. Gather round and hear the tale of the dumbest admin who ever lived.
"Sometimes it's hard to be a God", featuring the Clay Mod, full of Literal Metaphors (such as the world being named "The Heavens and the Earth"), faux-epic moments (such as green and blue soldiers parachuting in on feathers), and ultimately culminating in God just deciding to delete "The Heavens and the Earth".
RubberRoss's Derpcraft. What's even funnier is that the cartoon was based on his initial reactions.
The Weeping Angel mod, when spotlighted by the Yogscast, has one of the Angels going into Simon's house, and he doesn't have a pickaxe to destroy it with. How is this solved? By digging a hole in the floor, getting the Angel to fall into it... and just putting floor blocks over it. There's now a Weeping Angel trapped under the floorboards. Problem solved. When he realizes he's got no way to leave the house surrounded by Angels without dying and respawning in the house, he deletes the world to solve the problem.
After 34 minutes of fail in the 404 challenge, these two adventurers decide to give it one last try and make a "pimp room". The result is...well, just watch.
The Mob Rap 2 has a few joke verses, which come from the Chicken and the Squid. Also, Skeleton's reaction to Herobrine showing up can be seen as this.
The Mob Rap 3 has ''Enzio'', of all people singing a joke verse. And it is awesome. Skeleton trying to critize the Wither's' performance can also be considered hilarious.
This video is probably the most cheerful death montage ever recorded. It showcases 50 noteworthy deaths from a player who is prone to maniacal laughter, blind panic, and general clumsiness all at once.
The sequel video shows that this player has become more skilled, such that one of the only things keeping him from remaining alive is his sister, who is just as hysterical as he is.
The Luckiest Minecraft Player Ever, who mines a block directly underneath him in the Nether, falls directly into lava, must swim to a very far shore, is attacked by two Ghasts, and falls into a 2 by 2 lava hole—and somehow makes it out alive.
A Spanish LPer, while on Hardcore mode, tried to ensure his small house was safe, using a gate made of pistons and an alarm made of notes. The idea of using just an iron door apparently didn't cross his mind. The massive structure for the machinery took a lot of space, being several times bigger than the house itself. It was so poorly designed that it prevented him from enlarging the house, as it was surrounded on all its sides by the machinery. Not to mention that it took himquitesometime. The funny part? All this didn't help him when a creeper entered his house. Just see his Heroic BSODhere. The worst part? The creeper entered through the structure he had created to build the alarm. He could have avoided it if he hadn't built it in the first place.
The same LPer tried to get some steaks by killing some cows with fire. Instead of using flint and steel like anyone else would have done, this LPer tried it with lava. Unfortunately for him, when trying to get back the lava after burning the first cow, a misclick gave him a bucket of milk and a very hot death.
The same LPer built a witch farm in his survival series, but instead of lighting the area to prevent enemy spawning outside the farm, he went for the quickest solution, to built a huge tower. He eventually came to regret his decision, as some chapters later, he suffered the consequences. He had to spent an entire chapter to kill more than 200 zombies that had spawned in the surrounding area. The fight reached its climax in a cave where more than 160 zombies were lurking. To add more laughs, for some unknown reason, every single zombie happened to be wielding an egg.
In 1.6, the villagers were given voices. They also eerily resemble Squidward. Three guesses to who their talking sounds like...
Step 1: Play single player. Step 2: go about normally. Step 3: Make a stick or just grab a stick you have premade due to grossly overestimating how many sticks you need. Step 4: Get an anvil. Step Five: Create THE STICK OF DESTINY!
Spawning on a tiny island far, far, FAR away from any sort of mainland, and only having a small tree to work with is as fun as having a diamond pick shoved up your nose. Proceeding to turn all of the wood into sticks and not getting a sapling, however, is funny once your mind registers what you just did.
Squids seem to appear randomly for almost no reason at all.
Also from Element Animation, we have Villager News, which provides a hilarious interpretation of the villagers as they make their own news channel to showcase news stories that would otherwise be too mundane to even report. Almost every technological object not found in Minecraft are made up of villagers.
Testificate News, a extra for the aforementioned Villager News 2, addresses the problem by showing various villagers parodying various people trying to stop the spaceship. It doesn't work. And then the newscaster gets sucked into the spaceship...
One youtuber was doing a Let's Play of his own mod pack for the game, including The Lion King mod. At the end of the mod, he goes to the Upendi dimension, which is supposed to be a utopia like location free of hostile mobs. Between that episode (were he was enjoying the dimension once he got there) and the next, the Cubebot mod glitched and the next episode begins with Upendi overun by a gigantic swarm ofZombie Cubebots (which have been making his life hell since the update introducing them). He's forced to go to creative and then gleefully sets it to day so he can watch them burst into flames and die in the sunlight.
On another episode, a creeper somehow gets into his house and blows up, his reaction is hilarious. 
Whenever skeletons shoot each other. They'll stop pursuing you, turn to whoever shot them, and return the favor. A duel to the death will then commence.
Better yet, enclose them and take bets. It's cockfighting WITH SKELETONS!
It's even worse with witches. All it takes is one stray splash potion and suddenly every witch in the vicinity will turn on each other. And none of them will die because they heal themselves faster than they can inflict debuffs and damage. It's quite a sight to behold, but if you get caught in the crossfire, your death is assured.