Elmer Fudd is a Mad Scientist trying to create a formula to transform someone into a fiendish monster. Unfortunately, when he runs out of experimental animals, he is forced to capture Bugs Bunny. Unfortunately, his experiments are complicated by the rabbit's rascally behavior and the appearance of a grizzly bear.
Tropes appearing in this short:
- Ate the Spoon: Happens when Bugs mixes some formula for the bear, thinking it's Elmer.
- Box-and-Stick Trap: Elmer sets one up to trap a rabbit to test his formula. Bugs sees it and recognizes what it is ("My grandfather told me about them, but I never thought I'd see one."), but decides to get himself trapped since Elmer went to all the trouble to make one.
- Brick Joke: When Elmer gives his formula to his dog, the dog runs outside to eat grass. Later on, after inadvertently drinking the formula, Elmer runs outside as well. Not only is the dog still eating grass, but Elmer eats grass alongside him in the same manner.
- Mad Scientist: Elmer's role in the short. Unfortunately, his Psycho Serum experiment doesn't work out as he wanted.
- Mistaken Identity: After Elmer takes the formula and runs outside, he bumps into a bear and drops his hat. Bugs sees the bear with Elmer's hat and thinks the formula turned Elmer into the bear. He tries to make an antidote, but the bear dislikes it and eats one of Bugs' carrots to get rid of the bad taste. That's when the real Elmer comes in and mistakes the bear for a transformed Bugs.
- Psycho Serum: This is what Elmer is trying to make, but it doesn't quite work. Bugs at first appears to transform after drinking it, but he was just faking it. ("No soap, Doc.")
- Shout-Out: Watching Elmer's reaction to the formula, Bugs tells the audience "I think Spencer Tracy did it better, don't you, folks?" Tracy starred in the 1941 film version of The Strange Case of Dr. Jekyll and Mr. Hyde.
- Talking with Signs: As Elmer goes through histrionics after taking his own formula, Bugs comments on the situation by holding up a series of signs with Visual Puns, such as a screw and ball, a cracked pot, a dripping faucet, and a belfry with bats flying around it. In the end, as Bugs pretends to be a bear, the real bear is the one holding up the signs.
- Technicolor Science: The formula turns various colors as Elmer mixes it, including peppermint stripes. Whoever drinks it then turns the same sequence of colors.
- Visual Pun: As stated above, the Talking with Signs were gags for the phrases screwball, crackpot, big drip, and bats in the belfry.