At least, you (probably) have never done this:
My college philosophy instructor told us he once drove from college in Kansas to his home state of Nebraska. He had a terrible time opening the car door. Finally, after jiggling and bending the key in every direction, he got the door open. While driving, he thought, "That's odd. I wonder why the radio's digital display is green. It used to be blue." Later, he noticed a pair of sunglasses on the passenger seat and thought, "That's strange. Who would have left sunglasses in my car?"
When he finally got to his destination and opened the door, it dawned on him. He had inadvertently driven a car that wasn't his from one state to another. The car was the same make and model as his, but the obvious clues that it wasn't his didn't sink in until he'd reached Nebraska.
The next time I feel irritated about misplacing or forgetting something, I plan to remember this.
