I never really got the whole "insanity plea" thing.
It's how you get out of crap by taking no responsibility, because your rough ridin' "crazy in the brain". Even if you aren't, they just send you to some psych ward, cause they say you are. This is how I get out of saying stupid crap all the time: "It's ok guys, it's fanning, you have to forgive him, he's a little slow". I'm actually not slow, but I'll play the card sometimes if I have too.