The last valet mission piece ~ Every car you drive from the restaurant has a little bit of loose change lying about. You are on a timer and don't have time to go grabbing through the seats. Why not use physics and momentum to your advantage? Slam on the brakes, Put you pedal to the floor, or turn sharply - anything to get the money to the drivers seat.
A concurrent mission is a mission in the game that doesn't need to be completed to be able to progress. The player has the choice to do it or not. Enjoy!