While this may change many people's minds (one way or another) about drinking Red Bull, six German states have instituted a ban on selling Red Bull after finding it contained 0.4 micrograms of Cocaine per litre.  http://www.google.com/hostednews/ap/article/ALeqM5hItGF3n5rzcEdW6PnVTP-n8zY1agD98DCUQ01
Red Bull insists it's just the coca leaf extract used for flavour.