When I was in the third grade, a kid came to school with a large frosted chocolate cake. He said it was his birthday. He brought plates, napkins and even cups. We were so excited looking at the yummy cake.
Then the teacher was handed a large knife, and she started to cut the cake to hand out to the children. However, we soon found out the frosting was real, but the cake was a foam pillow.
This Happy April Fools joke did not make us happy at all.