😮 yawning

😂 laughter (e.g. Tanganyika laughter epidemic of 1962)

👏 applause / standing ovation

👀 looking where everybody else is looking

🌊 the stadium wave

These are useful starting examples because copying is immediately visible.

But some may be biological contagion rather than memes in Blackmore's strict sense.

One person suddenly looks intensely at the ceiling.

How many people look too?

Did information pass?

Was anything learned?

Would you call it a meme?