I used to travel a lot in eastern Oklahoma, and left a lot of stickers at gas stations in the middle of bumble fuck nowhere towns. Probably less smiles and more anger honestly, but fuck them. Also did some on a trip to Missouri, where I’m pretty sure it was illegal for me to piss.

“A trans person peed here” stickers in gas station bathrooms/other public bathrooms.

The Giant’s Drink from Ender’s Game always seemed really compelling to me. The emergent gameplay reacted to your state of mind and serving as some sort of arcane test of your mind.