whats so bad about it?! your lucky you even get a glimpse I know people who dont. Be happy someone's checking you out just smile and go on about your day its not that big of a deal just shrug it off
Look at him back but don't make it a friendly look. Not a bitchy glare either but you know how you look at a random person that doesn't really matter to you? Yeah look at him like that, he might stop. Maybe he keeps looking because he wants you to talk to him
That is so. AWKWARD.
I would just glare at him until he stops. Or "accidentally" inflict some pain. But...he might actually like that.