Ultimately, most human behaviour is geared toward survival, so what is regarded as insane tends to be psychological maladaption. That is to say mental unfitness. This is why we have the whole 'harmful to self or others' thing.
Biblical characters would be considered mad in our society because they are not socially adapted to the modern cultural environment. Not to mention that some of them acted like downright loopers. Ezekiel anyone?
Statistically, we would expect the greatest majority to be at least fairly well adapted to their environment, so like the man says, just act cool. Go out there, get yourself a nice, short-styled haircut and a pair of fashionable trainers, start listening to popular music and if you get the chance, bleat occasionaly. Nobody will be any the wiser.
Oh and one last thing. Whatever you do, don't let them know that you can think. Survival of the fittest means eliminating your competitors as well as your threats. If you show any sign of independent thought, they'll brand you a crackpot and chuck you in the crazy house.
Best of luck.
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"No one was behaving from very Buddhist motives. Then, thought Pigsy, he was hardly a Buddha, nor was he a monkey. Presently, he was a pig spirit changed into a little girl pretending to be a little boy to be offered to a water monster. It was all very simple to a pig spirit."
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