Little Joey and Little Danny, both aged 5, are walking home from
school. 

 Danny says "I won't be going to school tomorrow." 

"Why not?" asks Joey. 

"I have to go to the hospital," says Danny woefully. 

"That's awful," says Joey. "Why do you have to go there? Are you
sick?" 

Danny shakes his head and replies, "I have to have a circumcision." 

Joey stops dead in his tracks, an expression of complete horror across
his face, "That's Horrible!" he cries, "Why, I had that done when I was
born, and I couldn't walk for MONTHS!!"