What are five low‑cost guerrilla marketing ideas you've tried and actually worked?

Social Media
1

I recently saw a social post from a local museum. A guy was waving to the camera in front of the museum, and caption reads, “We are out of social ideas. Just come visit.“ It hit me like a charm and I was actually trying to identify the entrance of the museum in the short clips.

What examples have you encountered or come up with that actually work like this?

2

Handing out professional business cards and flyers at major events