Mannequin Head Drop Prank [VIDEO]

One of my friends showed me this video over the weekend and I laughed so hard that my back and stomach hurt.   I was laughing so hard that the people around me started laughing too and they didn't even know why I was laughing.  I'm not really sure why I found this so amusing because it's just a simple prank, but I did.  So, if you need a laugh, here's one for you: