What the hell? It's yet another weird manifestation of the placebo effect. You probably already know that you can give a guy with a headache a Tic Tac and tell him it's medicine, and there's a good chance it will fix his headache just like an aspirin would, for reasons science doesn't completely understand. Well, it turns out that that already illogical and somewhat insane phenomenon is also affected by the color of the pill. The reason is that how you perceive effectiveness affects effectiveness -- and when it comes to stuff you consume, color matters.

So, in a different experiment, subjects were told they were going to get a sedative or a stimulant, when in fact they were getting neither -- all of the pills were placebos. Yet 66 percent of the subjects who took blue pills reported feeling less alert, compared to only 26 percent of those who took pink pills. That's because we've been trained to think that blue = sleep.