An example: Tourists at the leaning tower of Pisa all doing the same (clichéd) pose.
Is there a single word for such behavior? It's not a flash mob, obviously, because it happens all year 'round. It's not mirroring because it's not subconscious behavior, but something very intentional. It's not synchronicity because it's not a spontaneous thing. It's not aping or copycatting either, since people aren't (necessarily) mimicking anyone in particular.
I suppose it's ritualistic, but that seems too serious for something so silly.
I suppose this behavior constitutes a meme, but I'm wondering if there's a better word for it. Or for the act itself; the act of participating in and propagating the meme.