SmartIdiot said:
This makes most sense so far. Knew the first paragraph, hadn't really considered the second, now I'm learning something.
To all the people giving the smart-ass-captain-obvious answers, you make me smile.
Psychologists have done experiments where they put a group of people in a social situation where alcohol would be consumed (such as a bar) and then give them nothing but alcohol-free drinks and they STILL act like they're getting drunk (ie talking louder, slurred speech, freedom of inhibitions, moving closer and becoming more interested in the opposite sex etc).
This simply happens because their brain thinks that's how they're supposed to act in that situation, regardless of whether or nor alcohol has been consumed. It's actually quite an interesting area of psychology.
EDIT: I forgot earlier, they can also wake up with headaches as if they're hungover from such an experiment. The subconscious mind really plays quite a large part in determining behaviour and how the body responds to certain situations.