Why did the students eat their homework?
Because the teacher told them it was a piece of cake!
Piece of Cake Homework
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Explanation
Experiment
Explain Bear
Hey, dummy! The joke is a pun. "A piece of cake" means the homework WAS easy, but the teacher ALSO meant to literally eat a slice of cake. I know you wouldn't get it, since you're probably as dumb as the people who wrote this joke.