I was thinking it would be neat to implement insanity in some fashion. The most obvious(to me) way of doing this is adding in an insanity counter. To be clear, a variable that increments every time you use a stealth-boy. Sure, during a certain quest, a doctor says stealth boys shouldn't cause you to go insane, but your just (un)lucky like that.
So my question is this, how do you think insanity should be tracked in game, and what should happen as you lose your marbles? Lets try and keep requests somewhat easy to impliment.Like no requesting Cthulhu to appear every now and then cause you to murder a random npc, as cool as that would be, I doubt anyone would create the monster(Though, I admit it would be neat.).
To get the ball rolling,
Insanity kept track by and increased from stealth boy usage
Insanity causes: Hallucinations that other npcs ignore, you cannot gain exp or loot from killing. A couple examples would be a Gary clone appearing.. Perhaps a death claw named snuggles, having a go at another hallucination, oh the horror! (Of course would have to clear it with snuggles creator.)