Interesting concept - I have actually programmed my brain to do this very thing with the help of my fiancee. Every time I leave the house or her dorm, she simply says, "cell phone keys wallet" which is a trigger in my brain to check my pockets for those things. Now she's done it so often that I do it automatically basically anytime I leave a room.

The downside is now she messes with my head because she'll purposefully take one of those things from me without my knowledge and then say the magic words to freak me out thinking my wallet is lost.

We love each other so much...