I go for a thumbs up in that scenario.

I enjoy giving compliments to passing strangers because I know how much it means to me in the rare occasions that I have received one. Of course i’m very careful to not choose stress-inducing topics and not to time it when the subject would be stuck with me, e.g. an elevator.

I get to see so many smiles from recognizing cartoon characters on kids’ clothes, complimenting older guys on their bold hat choices, or someone’s colorful glasses frames.

The world needs more smiles!