Brothers Sholto and Hugo Brown, who make art under the name id-iom, have for more than a decade been adding the subtlest blink-and-you'll-miss-them jokes across the urban landscape.
1. This wine description, left in a Tesco Local.
Originally from the Isle of Man, the Brixton-based pair have been in the capital since around 2000 and have had their work featured in galleries – but you may have already seen their work without knowing it.
2. An advert for Disney's latest 18-rated film.
Sholto told BuzzFeed: "I think we started doing street art as we like to work big and sometimes pieces of paper just don't cut it. Plus it's a guaranteed way that at least some people will see your work."