Well... apparently I felt like it. Here are some more stupidity prevention devices.
Short and to the point. When the patient considers doing an act of idiocy, he gets shot.
A really obvious concept. The drill activates when one acts like a total shithead. Any asshole thinking of something stupid gets a skull full of brain chowder.
Here we have a device that makes you blind. If one thinks like a dumbass the metallic helmet begins to inject poison into the eyes. If this doesn't make you blind/dead, then I'll assume that interdimensional gnomes do instead.