According to this Web site, the Mumbai Traffic Police have started disseminating these coasters (at left), which are printed with a type of red ink that only appears when wet.
Thus: Order a frosty beer; enjoy the mug, glistening sweat; finish draught; admire mugshots of people with what appear to be head wounds.
It's gruesome, shocking, tasteless, and a little bit fantastic. I love it when art and technology collide, particularly in such a public forum.
That said, I have absolutely no idea of the back story for this; when S and I were in Mumbai, we certainly didn't notice any of these while we were quaffing innumerable pints. There's also little buzz about drunk driving in recent media, so the catalyzing event for this macabre exhibition will remain a mystery for me.