This isn't mine, but a friend told me this one in middle school:
He was eating a Popsicle one April Fool's day. He began chocking on it, and hastily told his dad. He started laughing "Har har, April Fools! Nice Try." My friend then continued to choke until the Popsicle came flying out of his mouth, which then wiped the smile off of his Dad's face.
Sad story, but funny