Wait until the busiest time of day on the busiest day of the year. Maybe Black Friday. Wait in line with nothing. When you get to the cash register, make intense eye contact with the cashier. Maintain eye contact. Motionlessly, wordlessly stare. Let nothing and no one move you. When security hauls you away, do not lose eye contact. Keep staring at that poor, harassed cashier. You have solidified yourself in their memory. They will never forget you.