Never had the chance to try it out, but I keep my Casi EX-Z750 in a pocket and set to movie mode for a quick grab. Takes me about 5 seconds to stop, grab it, power it up and start shooting.
Most punks don't like a camera on them.
I would love for someone to develop a small surveillance camera that records for an hour that you could just attach to the seat post pointing backwards and leave running.
Glad everything came out OK. Here's hoping your future rides are better!