It's not expected that you'll dump things on your head.
Terry has been drinking with his buddies for hours at a pool party.
Terry wants to make his friends laugh.
Terry tells his friends a very amusing story.
Terry grabs a nearby garbage can and empties the content out on his own head.
Terry's friends think he is the funniest person ever - they love him.
Terry's friends laugh but think Terry is kind of disgusting.