Hobbes asks Calvin what he's doing with all Dad's tools in the bathroom. Calvin tells him the faucet drips, so he's going to fix it. Hobbes clarifies that Calvin is going to fix it. As Calvin prepares to use the wrench, he tells Dr. Doom he can keep his comments to himself.

Calvin says fixing a faucet is easy. All you do is take it apart, see what's leaking, plug it up, and put it back together. Hobbes asks if Mom knows he's doing this. Calvin says no, it's a surprise. Hobbes rolls his eyes and says we all know how she loves surprises. Calvin is having trouble getting the handle off. He asks Hobbes to pass him the hacksaw.

Hobbes asks if you aren't supposed to turn off the water before taking apart a faucet. Calvin angrily tells Hobbes that's the problem he's trying to fix. You can't turn the water off because the faucet leaks. Calvin wonders where Hobbes was when they were passing out the brains. Suddenly, water starts spraying from the faucet. Hobbes says he'll get some paper and carbons for Calvin's written apology.

In a panic, Calvin asks Hobbes how to turn off the water. Hobbes doesn't know. Calvin can't put a piece back in with all the water coming out. Hobbes goes to get Mom. Calvin asks if Hobbes has lost his mind. He says Mom can't find out about this. Hobbes believes she'll notice when the kitchen ceiling starts to drip. Calvin opens the medicine cabinet, looking for cyanide.

Mom and Dad are sitting downstairs reading. They hear Calvin singing about getting a bucket, that nothing's wrong, how many buckets do they have, no cause for alarm, and no need to panic. Mom and Dad look at each other, point at each other, and both say "Your turn".

Dad yells up the stairs asking what Calvin's doing. He says he's going to the bathroom as the toilet flushes. Dad asks if everything is alright. Calvin says things are fine and not to come up. Hobbes is flushing the toilet while Calvin is up to his waist in water.

Dad hears the water, and he comes into the bathroom. He walks into the spraying water. He sputters about what's going on. He shuts the water off and looks for Calvin, who's hiding behind the shower curtain. Dad tells Calvin it's the end of the world.

Dad asks Calvin what he was doing. Calvin tells him he was looking for dental floss and the handle blew sky high by itself. He changes his story to Hobbes playing around with Dad's tools. Calvin tried to stop Hobbes, but he wouldn't listen. Dad gives Calvin one more try. Calvin tells him big, bug-eyed monsters from Pluto did it and made him swear not to tell.

Calvin and Hobbes are walking outside. Calvin complains that Dad blew his stack and calls Dad a sorehead. Calvin rants that Dad acts like nobody ever needed to call a plumber before. He says Dad has a job and can afford it. He says Dad makes such a big deal out of everything. Hobbes wishes that when Dad does, that Calvin would quit trying to pin his crimes on Hobbes. Calvin tells Hobbes not to start on him, too.