Only in Oxford...

...would they insist on grammatically correct graffiti. The old Blackwells music shop has been painted recently and there were lots of WET PAINT signs, put up with yellow tape. These have since been the target of wags turning that message into new words; but surely only in Oxford would someone take the trouble to put the apostrophe into "ain't".

(I had to desaturate the background in order to partially fulfil my monochrome pledge).