My students eat lunch in my classroom which always provides for some good laughs.
I bet this story is funnier when I tell it with my impersonations of the kids.... but here is one of my favorites:
Me: Peanuts.
All the students: ewwwww
Student 1: Where do peanuts come from?
Me: The grow in the ground.
All the students: ewwwww
Student 2: What is butter made of?
Me: Milk
All the students: ewwww
Student 3: What are rainbows made of?
Me: Something magical.
All the students: ewwww