This happens to me sometimes, especially in trains or busses, where I dont know where to look, or what to look at, with my limited vision, as only my left eye works. So I sometimes end up locking gazes with someone and then being kinda like ERMAHGERDDONTSTARE and just panic and look at the next best thing - usually at something outside the window. But ... what do you do when you and someone are looking at the window, and your views cross through the reflection? That's the moment I just feel so defeated, that i stare. xD