Bloody Coasters (for Mumbai Traffic Police) were printed using a special invisible red ink, wich spreads only when moistened. They were placed at tables and bar counters in Mumbai’s prominent bars and watering holes. When a customer places his frosted, moist glass of alchohol on it, the red ink starts spreading; and the normal face starts bleeding. Alongside, the message reads: Just a reminder: Drunken driving kills.
Agency: Contract, Mumbai, India. Found at DirectDaily.