Do you ever get it where you see someone, but it's at a sort of funky angle for you, so normally you wouldn't have seen the someone, and so you just go on like you don't see the someone? But for the someone it's not at all a funky angle and you are fairly certain they see you. And then you wait for the someone to say hi, but they never say hi, so you finally give in and act like you are looking off to the side, and suddenly see them, and give a "hi!"

And then the someone looks all surprised and excited and exclaims "hi!"

But really, you secretly know the someone is lying...and wouldn't have said hi.

Pish posh.