Best Facebook Pranks? Stories

My friend recently hacked my facebook and wrote some stupid stuff, that pissed off my girlfriend. It got me thinking about a story I read of a guy that would copy a person's default picture and add them as a friend. What other funny or absurd pranks you could do on facebook? Any stories?

This is video from a buddy of mine, he made that is out there but also highlights the absurdity of Facebook pranks.

Poster :