[Buckeye McFrog]

...a curb with a metal cap that had been pulled up and edge went deep into the tire.

Tons of those in my neighborhood. By this point all deteriorated and presenting a hazard more than anything else. We sure took care of Big Steel in this town at one time.

[PenguinM]

Two summers ago, I was traversing from 5th Ave towards Washington Blvd..crossing over Penn Ave, a car came into my lane and I swerved & hit the curb that had a metal edge. *Pffffffft* went my tire (Instant lit up dashboard - flat tire - thanks, Cap’n Obvious). I was soooo mad!!!