They're called the “Tutor Crowd.” And they're on a mission to correct all of the city's street grammar mistakes…yo.
OK (okay), so this is just an ambient ad campaign for a find a tutor website.
But it's a pretty cool idea. Ad agency: Arc, London.
But wherever Londoners tag badly, they respond.
Apostrophe disregard is of course one of the biggest street spelling crimes.
Just because you're horny, doesn't mean you should be disrespectful.