What the hell is it with all the twins I see on my commute into work?

I take a bus to and from work, and there are a lot of twins. I see a set of twins getting on the bus every day. I'm not talking about people wearing the same outfit either, I literally mean there are a lot of identical looking people. I've never said anything to them, but I see a lot of them. I see a lot of the same faces on the bus too, so I don't know if I just see twins and the same people every day because I ride the bus at the same time every day.