I was a Hot Wheels/Matchbox kid....I never had the tracks, but my friends and I would play a game where we'd take turns picking cars out of the bin in a sort of "draft", then have a round robin tournament where we'd shove them so they'd roll into one another in a high speed collision--if the car flipped and landed upside down it was out, keep smashing till at least one flips, last one with cars left won.* Needless to say, my old Hot Wheels wouldn't do too well on eBay.

*For the record, there was a Formula 1/Indy-style car that was almost unbeatable in that game--it was too low to flip, and the other cars would hit its front spoiler with their wheels and usually go right over.