I nearly got robbed once. I was commuting home when a bunch of annoying people (pickpockets) started amiably chatting with me (they pointed something out and I didn't want to be rude). They almost got me (I actually ended up lampshading the possibility while in conversation;
why I didn't act on my suspicions was beyond me). Nobody called my attention to it, except maybe for
this old lady who tried to warn me and nudged them enough to drop the item that they were trying to steal from me.
The pickpockets hit her hard on the head as they fled.