but you look shifty as hell

Duude!! Then the security guy at the door gives you that look...

That's what a shop lifter would think

I once went to a store that didn't have an exit that didn't pass through the (only French-speaking) check-out counters, and no self-checkout. I tried to leave without buying because I hadn't found what I wanted, but, after realizing the situation, I just wandered aimlessly in the store for ten minutes, trying not to look like a terrorist (being, like, the only brown person in the store). Finally I bought a bottle of coke (which I rarely even drink), just so I could get out.