Here where I live (paris-), it is not uncommon to find your hippest bar, bathroom stall, or corner fully crowded with stickers and messages. Most of those are some underground project marketing, artwork, etc. But the most interesting to me are those cleverly formulated (somewhat) awakening statements (often political).

I personally get excited every time i see some bitcoin shill in an unexpected place, but I understand I am highly biased. Not intending to deface anyone's property, it seems fun to run a sticker/poster campaign with some basic bitcoiner motto on it.

What are your thoughts on this clandestine form of marketing ? What other forms have you encountered ?