Uncle Grandpa Cooks a Burrito is a nameless short after "Prank Wars".
The short starts with Uncle Grandpa putting a burrito in the microwave in the kitchen. All his friends come in to ask him what he's doing, and he repeatedly tells them that he's cooking a burrito. When the microwave timer goes off, he opens it and finds out he put his shoe in the microwave. He wonders wear his burrito is, and looks down to find that he put his burrito on his foot where his shoe should be. This does not bother Uncle Grandpa, so he goes right ahead and contently eats it.