One of the pranks I used to play in college was to dial the phone number of one of my friends, who typically was having relationship problems, and as soon as their phone would start ringing, I would immediately put them on conference call and dial their recent ex and then sit back and watch as both people thought that the other person was calling them. In retrospect it probably wasnt a very nice thing to do, but the results were always unpredictable and hilarious.
Sometimes theyd just start fighting, other times they would actually make up, but most times there would be a certain awkwardness as both parties thought the other had called, but couldnt figure out why. While it may not have been the nicest practical joke, today Forbes magazine played a similar version of this gag when they invited some of the top technology firms to interact with Hollywood fat cats at their MEET (Media Electronic Entertainment Technology) 2006 conference.
The list of technology experts was a literal whos who of the geek world. TiVo, Sling, Netflix, Apple, Google, YouTube, you name it, the list went on and on. While many of these technology companies came to court Hollywood into embracing them as business partners, they faced a tough crowd and a hard sell for an industry that hasnt been forced to make significant changes in the last 30 years. In a nice overview of the conference, Paul Bonds with The Hollywood Reporter, gives a great run down on some of the more memorable recaps.