that's really not a bad idea
Save business cards of people you don't like. If you ever hit a parked car accidentally, just write "Sorry" on the back of one and leave it on the windshield.
Satan (impatiently) to Newcomer: The trouble with you Chicago people is, that you think you are the best people down here; whereas you are merely the most numerous.
- - - Mark Twain, "Pudd'nhead Wilson's New Calendar" 1897