when you say "debit or credit?" and without waiting for a response swipe the side of your hand across the back of someone's bare neck in a swiping motion
if you're asked "debit or credit" and reply with "none" or "paypal" you will be murdered
when someone says "debit or credit?" and swipes their hand across the back of your bare neck.
if you say "neither" when asked "debit or credit" you will be punished :)