Am I the only DM who asks players to make saving throws when there is nothing to save against? Sure, they don't know the roll is mechanically meaningless, but do it often enough that they're not quite sure which rolls are real and which are fake and the metagaming decreases dramatically.
Player paranoia does increase for a bit, though, especially if you just ask for their modifier and make a secret roll. This helps greatly in games where the players being paranoid is more immersive, such as in horror games/situations.
That's interesting, I may have to try it sometime. How often do you ask for saving throws? I normally would tell the players what they are saving against (i.e. save against poison) so they can add any conditional modifiers. Do you have them roll randomly against poison, or mind-affects, or whatever? Do your players like this system (assuming they've played in games where the GM hasn't done this)?