lol, me and my friends ride around and try to hit eachothers engine kills switches while driving lmfao, its super fun but really dangerous above 100.
Buy a couple of older Toyota Corollas, like 1985 ish, the ones with the nice rubber bumpers

play tag at night (this includes actually bumping into the other person). Luckily those cars are cheap and are really stable so it is still fairly safe. However we still ALWAYS wear our bike helmets when we do anything stupid.
"a game alot of ppl play is car tag.
its where you get within a foot or so of your friends car
and thats a tag then he has to catchup with you and do the same.
while doing high speeds on the local highways"
We also play a game like this too, but it requires getting within a few feet of the car and being able to reach out and touch it with your hand.