This is latest video hilarity I discovered during my regular 3 am Sunday night insomnia. If you don't have headphones, these aren't safe for work. Even if you do have headphones, you'll start laughing which isn't safe for work either. View at your own risk. ;)
Here are a series of escalating pranks between two co-workers (Amir and Streeter) at collegehumor.com. Start from the bottom and go up.