Eternal darkness is an old gamecube game from 2002 for context it's a horror game that convinced some players that they were insane or their game was broken :p
I swear that game is crazy in a good way I've never seen anything like it, the sanity bar literally messes with your tv by changing volume, changing it to video, and turn the screen black. Sometimes the character will use it's weapon at the tv screen and just make the character do some silly things.
it's bizarre but creative and if you want to see more of the Sanity effects here's the link. ^_^