Had one on my first road bike 1 week after picking it up. Didn't have the contacts that i do now and had to fork out £145 for a Dunlop D207! Being a builder ive developed a sixth sense for spotting nails and screws because I encounter some real thoughtless gits on jobs and at the merchants e.g. dropping a box of screws, picking most of them up then thinking sod it that'll do. I've even stopped in the road to clear them up after i've swerved round them. That way i've got a clear(ish) conscience for the rest of the day.