Original Head Table Smash (Video)
It's impressive what stupid things people will do to make people laugh. For instance, take this kid who slammed his head into a table as his friends watched, filmed, and laughed.
It's unknown if he had any injuries from this stunt besides the bloody face, but if not, I bet he had a pretty solid headache for a while. If anything, learn from his mistake and don't intentionally smash your head on the table.