leap off your bike, take your chain off as you spin around in midair, land on the hood of the cab, and swing the chain through the windshield - breaking through it. Then, punch the cabbie in the face. Grab him by the collar and say "don't fück with the bikers, motherfücker!", then leap back onto your bike (which should still be standing) and speed off through that left hand turn signal that just changed for you.