I went to a festival on the week-end and I saw a few JW's there. Some saw me and said hello, while others looked away when they saw me.
Sometimes, I have only a fraction of a second to decide how I'll react. Either I say hello first, or wait for them to say hello, knowing that they might shun me and won't even bother saying hello in return, like one did this week end.
I'm pretty good at knowing who will shun me now....