I didn't get a car (and didn't really learn to drive) until I was 26. This wasn't a problem when I lived abroad, but there were a few years there where I got a lot of rides. A friend at MFGAM took me along when he went to the grocery store. Other friends dropped me off at the airport. There were expeditions to Target, to San Francisco, to various parks. The summers during college I more or less had to be driven everywhere. (Or stay in one place - there was a lot of that, too.) Good thing you could walk pretty much everywhere in college. (But thanks for the rides, Spice and J.Vo!)
So the upshot of this is that I now owe a ride to everyone in the world. This weekend I had two rehearsals and a barn dance, and I drove other people to all of them. Rawr. I think now I just have to give the other science writer who lives in my neighborhood a couple million rides to Giant and the airport, and the world and I will be even.