It is a Friday night, and I am not out getting drunk with friends as God intended. Instead I am at home studying the mental status exam and the implications of evolutionary psychology for future research. My consolations are few at the moment, but let me share something cool that I learned.
Say you are walking around one day when a flying saucer lands in front of you and a lithe, buxom (if slightly green-skinned) alien emerges to gather samples of earthling sexual energy. How do you know if you are crazy or not?
The answer is simple: touch him/her. Hallucinations derived from mental disorders tend to only be audial or visual, so if you can touch said alien it is probably real. Well, you know.
Hallucinations that are olfactory or tactile tend to derive from more organic disorders or from substance abuse, so if you are on a mess o' mushrooms then all bets are off. Still, it seems like a cool way of being able to distinguish reality from non-reality.
Now you know. And knowing is half the battle!