Once a coworker of mine sent an emain to another friend/co-worker.. bitching about his job..
..not really bad but the typical "Man, this is BS!.. blah blah.. I should quit!.. I deserve more money,, yadda yadda" type sentiment that someone goes through when they have a bad day.
We got the e-mail, and you know how you can "spoof" the e-mail thread so it *looks like* the e-mail has been CC'd and/or forwarded to anyone you want it to look like.. we sent it back to where it looked like every single bigwig in the company had been copied in, including the CEO.. he almost had a heart attack right there... haahahha
Office pranks really are great.
I used to work at night with Asian countries. If things were slow we would just call a company in singapore at random and conference them in with another company in Hong Kong called at random. I would tell them I was the long distance operator from New Deli India and then hook them together. At 3AM it was a hoot.