To add some levity to our collective lockdowns, over the next few days and weeks I shall be publishing a collection of more than a 100 of my photos, that I've called (Unmanned) Barriers to Entry. They've been variously taken in France, the UK and the US, and they are almost all of signage.
Wherever I've taken them, their common theme is to demand that you obey their explicit command(s) that begin "Do not...". Some are amusing, but many are just plain rude - it's a form of inexpensive, non-verbal bullying and rudeness.
If you were to replace the signage with a human being, they'd ask you nicely. "Please do not enter". But that's not cost effective, so the courteous verbal message is substituted with an aggressive image and/or text that basically tells the reader to bog off.