Funniest prank calls?

[J-Man]

5 minutes ago, I just pranked a cold caller. I pretty much pranked them like in this video:

http://uk.youtube.com/watch?v=J5z4Vs26-TI

Have you guys ever done any hilarious prank calls?

 

[Erana]

*holds phone to GLADoS*
Seriously, after I showed some of the chicks Portal, they were sending voicemails of her to their boyfriends.

 

[Rigs83]

http://www.youtube.com/watch?v=J5z4Vs26-TI[/youtube]

 

[HardRockSamurai]

http://www.youtube.com/watch?v=J5z4Vs26-TI[/youtube]

I've seen this one at least a thousand times, and I still find it hilarious.

Seriously, I think this may be the funniest phone prank ever!