A series of ads for Samaritans of Singapore illustrate how people who suffer from depression often mask their real state. The graffiti, expressed in ambigrams, says something completely different when turned upside down. See more examples at Laughing Squid. Link
NEATOSHOP'S HUGE SALE - Save up to 20% Off All Shirts!
Save big on Funny Shirts, Science Shirts, Sci-fi Sshirts & more! Hurry: Sale ends soon!