I'm not talking strangers but people you would be on nodding acquanintance with. Like the stocker at the supermarket or another caretaker you see at collection time and then in the town.
One guy in particular gives me the creeps up to my eyeballs. I have seen him about on my own and said hello and he just blanks me completely. But then if I'm with one of my kids he is very effusive and comes over and is all chatty and smiles.
Despite all this he gives me the creeps just in general.
So much so that I told ds2 today to never speak to this man unless I was also there.