A similar thing happened with me and my sister. We were riding with our then boyfriends somewhere and got a flat. Niether of the guys knew how to change it. Both my sister and I did. It was late, and a cop stopped to check on us, a lady cop, she laughed when we told her what was going on, taught both of them right then and there how to change the tire.

I also helped a younger girl change her tire for her in a parking lot, she was really greatful she didn't have to call her dad.