I have a whole book bag worth of them (say 350-500 cars) and i used to put them behind people's tyres so when they backed out they smashed them... I melted one once with one of thoes blowtorch thingys you sweat pipes with - the blob om metal is still on the concrete out on the patio
I used to have a bunch when I was a little kid. Now I only have a small amount that I've bought recently, basically super-exotics- Veyron, Enzo, Testarossa, etc.
Man, reading some of the previous posts made me a little ill, poor cars.
I never really was capable of destroying them in such 'creative' ways. I only have about 30 Hot Wheels or so, with like 15 Matchbox ones and about 3 Majorette.
I used to have this rug with roads drawn on it (even a small track) I'd play on it for hours with my collection.