I've sat in my car, turned on the engine, then put my hand against my front pocket and thought "Oh ****, where are my keys?"
I've also taken my keys out of my pocket, put them in my right hand while also holding onto a bag, reached my car and then went back to my left pocket, again thinking "Oh ****, where are my keys?"
I always keep my keys in my front left pocket, and am paranoid I'm going to lose them. If they are ever not there, I always instantly think I left them somewhere. Even if they just happen to be in my other hand or in the ignition of my car as I'm sitting in the driver's seat ready to take off.
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Can't sleep, clown will eat me.