I do flat on the bike, but the worst for me is my car! Once hit an aluminum siding strip that fell off a truck in front of me. Went to avoid it, and the thing bounced under the wheel anyway. 7 punctures in one tire. Had to get a new tire. However, the tires on my mtn bike cost more than the tires I use on the car (Continental traction pro vs goodyear alegra) so I guess I should not complain LOL.