(A customer in his late 30s comes through my line with a few food items, a pack of printer paper, and a can of compressed air.)

Me: “Hi. Find everything you needed today?”

Customer: “I did, thank you.”

(When I scan the canned air, the register automatically asks for ID.)

Me: “May I please see your ID?”

Customer: “Sure, but what for?”

Me: “It’s for the canned air. The register won’t process an age-restricted product without actually scanning an ID.”

Customer: “Why is it age-restricted?”

Me: “Well, kids inhale it to get high. It really messes you up.”

Customer: “Really?”

(He looks down at his order.)

Customer: “Think I should get another can?”