Roll a car five times from one crash.
30 (G)

You must start off with a small compact car, preferably a "Futo".  once you have the futo go go to the airport and find the little yellow signs that say "caution blast".  these signs are actually ramps.  get some speed and hit the corner of the ramp with the car and you should roll 5 or more times, if not keep trying you will get it eventually.