About NYC, I had a Honda 600 Coupe that I could not find a starter for. The car was small enough to push myself but people in NYC would always run over and start pushing without even being asked.
I used to walk all over Manhatten. For some reason people always asked me for direction and for the most part I could help them. Sometimes spontanious conversations who pop up on the best subway line or bus line with transfer points etc.
I remember standing by "The Tree" and someone came around handing out Chrismas Carols. Stranges would just walk up and sing a few songs, smile and walk away.
Just scratch the surface of a New Yorker and they are just the same as anyone else. I'm pretty sure someone would help you pick up the bike.