Great stuff Ace...reminds me of some paintball scenarios we used to play.
A couple more for y'all:
Freeze Tag: If the car that is "IT" touches you, you must stop and stay still until another car touches you and unfreezes you.
Reverse Tag: Car that is "IT" is trying NOT to get tagged by all the other cars which are chasing him. Whoever touches "IT" then becomes "IT" and runs like hell!