>I'm starting to think pinch flats are an urban legend.

Heh. I've had two. One on a 23mm road tyre at over 100psi (hit a minuscule kerb just a little too hard). The other was a 40-something mm knobby mtb tyre - forgot to pump up the tyres after I got the bike off the web. Must have been something like 10-15 psi

Both times I had to wonder why rims can't be made gentler on tubes - why should they be so sharp?