Back when I was driving a lot to college during my undergrad tenure, I probably experienced more flat tires in those three and a half years than I did in my entire life outside of it.
And strangely enough, they almost always seemed to happen in close proximity to a tire shop. How fortunate, right?
I remember after getting out of my car and inspecting my fourth or fifth nail, a person walking on the street saw me looking at my wheel while shaking his head.