Not much skill required I don't think

Kinda reminds me during the height of covid. Town had like this scavenger hunt to keep people occupied. They'd post hints where to find objects and when found you would post pictures of the found items. Lots of times was painted rocks with little messages.

Of course. We used to do it often.
We also wrote notes on a load of cranes we made but we still need to leave them in places

One time I saw a guy who wasn't even looking for a sign and it basically jumped out in front of him. I was at one end of the parking lot getting out of my car and I heard this loud smacking noise and I looked over and a traffic sign was shaking and this guy was on the ground holding his face. Apparently he had walked right into it. I was in a bad mood at the time so I didn't laugh or anything which I'm glad about because they say you should not mock others misfortune because you might be next.

There's a local kid who paints messages on rocks and leaves the on porches around the neighborhood! Pretty cool!

My daughter use to paint up rocks and leave them all over town

I could never write that pretty. I am dyslexic and they call my chicken scratch dysgraphia.

Beats rockpainting by skinheads. Every 4/20 (Hitler's birthday) skinheads paint a swastika on Plymouth Rock

Hit them in the head with it?