I have no idea where this came from or whom I should be crediting, but I thought that it was very clever:
Obviously, drawing or writing on other people’s things is very naughty, no matter what font you choose to employ.
UPDATE: OK, according to a Facebook commenter, we need to thank Banksy for this. Thanks, Dr F. And… er… Banksy.
Absolutely gobsmackingly good, what a mind and a thought process – simply brilliant, well done Banksy