I've been interested in phreaking and prank phone calls since I was 10 or 11, but never really got past making a red box from a YakBak and totally failed it at using it.
However, my record with prank phone calls is far better. I've been calling Pat Robertson's 700 Club "prayer line" (800-759-0700) for years and years. My favorite prayer request in recent memory went something like this...
Me: Y'all I want to pray for someone today
Black Lady: Who do you want to pray for
Me: Do a lot of people pray for our president?
BL: Yes, many people ask for that. Would you like to pray for our president?
Me: Naw, sounds like he's got enough prayer. I want to pray for someone that doesn't get that much prayer, to even things out. Has anyone prayed for Bin Laden?
BL: No... would you like me to pray for Bin Laden.
...and then she prayed for Bin Laden, and I laughed my ass off. I need a way to record calls off my cell phone, so I can share the lulz.