Brazilian coffee brand Cafe Pele set out to prove that yawning is contagious with this clever outdoor stunt. It placed an interactive panel with a motion sensor among commuters, and fixed it so that the man in the poster would yawn when anyone came near. The commuters then started yawning themselves, at which point the panel showed a message: "Did you yawn too? It's time for coffee." A bunch of glamorous promoters from Cafe Pele then stepped in to serve cups of coffee. The campaign was devised by Sao Paulo agency Lew Lara/TBWA.