Old school phreaking meets X-Men Origins: Wolverine?
You only need three people to make a blue box if you're standing around bored - two whistling at the proper pitches to make DTMF tones and a third to whistle in-band signaling tones. Finding someplace to whistle to is a bit trickier.
(Thanks, Lyssa and Jade! Anybody got an oscilloscope we can borrow?)