I love a good prank, and so do 95% of people. So most of the time it is OK to walk around and pull a fast one, even if it's on someone you don't know. But when you walk around asking complete strangers if they want to kiss your ass it can be a very, very bad idea! 

If you get tired of watching this dude asking people to kiss his ass and want to get right to the action, fast forward to about 2:30. Also, be careful as there is language in the video that may be offensive to some...

The funniest part about this whole video is that the dude acts so happy that he got knocked out. Oh, and then he says he didn't even notice that it happened... I bet he does the next day when he isn't living in concussion land!