Nice touch on the "admin from hell" prank...
I read through this description of a great prank that I originally found via Scoble. It was an entertaining read, but my favorite part was this little snippit at the end:
Williaml is a deaf developer in our group; before the group meeting, Meredyth let him in on the secret so he would know what was going on during the finale.
I thought that was such a classy thing to do that it was worth calling out separately.