I received an email from a good friend of mine this evening with the following:
Remove the glass from the doors of a busy mall and what do you get? A hilarious prank! Watch as these poor people go to push a door open only to get a handful of air and a face full of awkward. This is such a simple prank to pull off and you get a great reaction.
Here is a link to the video. Windows Media Player is required. Enjoy!