A reader in London just sent us the following photo, which is fairly self-explanatory:

He included this note:

Please see attached a poster seen stuck on to a bus stop on corner of Mission Grove and Carisbrooke Road, London E17. Signs of subtlety in the message — avoiding items that might be thought of as controversial like killing homosexuals and stuffing women in bags.

I’ve extracted the poster from the image and removed the foreshortening to make a more readable copy: