Pranks performed on April Fool"s Day range from the simple, (such as saying, "Your shoe"s untied!), to the elaborate. Setting a roommate"s alarm clock back an hour is a common gag. The news media even gets involved. For instance, a British short film once shown on April Fool"s Day was a fairly detailed documentary about "spaghetti farmers" and how they harvest their crop from the spaghetti trees. Whatever the prank, the trickster usually ends it by yelling to his victim, "April Fool!"