a monkey fucking a football
Two people trying to do something simple, like tie a shoelace, but it turns into a full-blown wrestling match with no clear winner.
They tried to make a sandwich, and now they're wrestling over a piece of bread.
He and his friend tried to build a treehouse, and now they're both covered in dirt and screaming.
They tried to play chess, and it turned into a full-blown fight over a single pawn.