Sometimes it can even be dangerous. Eons ago, when I was young, I was JRA on a country road when I noticed a woman at the roadside looking helplessly to her small motorcycle. I slowed almost to a stop and asked her if she needed anything. A second later a man came running, yelling to me to get the hell out of there and quit molesting his girlfriend. Looks like he was teaching her to ride, she went solo and the bike stalled. He looked violent and unstable, so I didn't even bother to argue with him, just continued riding. Back home, I wondered if the crazy guy could take it against her too, but there was nothing I could do about it.