Haha! I remember latching onto school buses and other large vehicles at stoplights when I was younger. Stay close enough, and you could get sucked along at incredible speeds. It was interesting how some drivers would get super-pissed, while others would think "hey, that's awesome!" and help you stay attached.

Riding in a pack is a whole different experience, though. You have to be hyper-aware and -predictable in your lines, but the feeling of cruising along at over 20 MPH on a flat, aided only by your fellow cyclists, is something special.