pencil behind your ear, make a fast mental picture in your mind. Actually “see” the pencil going into your ear—all the way.
The idea may make you shudder, but when you think of that pencil, you’ll know where it is. That silly association of seeing the pencil go into your ear forced you to think of two things in a fraction of a second: 1) the pencil, and 2) where you were putting it. Problem solved!