Have you ever seen a stranger seemingly doing Reality Checks?

I did, today. I was waiting for the bus when on the other side of the road, one person out of those waiting there looked at his hands for a while, then plugged his nose and closed his eyes, he looked like he was drifting off a little, then he opened them again quickly. It looked a lot like he was doing RCs which I found sort of interesting.

Ever seen something like that?