Not really an AIBU but I really need to know. If the bus is empty except for a couple of people, have you ever sat down directly next to someone? And if so why 
I mean a stranger obviously, and if this has happened to you what (if anything) did you say to that person?
I can’t comprehend the logic in it at all
So far I’ve just sat silently wondering why me but in the future think I might say something!
This doesn’t include people with disabilities that have no social boundaries or would like to be close to someone (maybe due to fear or anxiety), I can totally respect that.