An Exacting Complication

(I and two of my friends are at a convenience store buying drinks. My friends drink is 2.73 including tax. He hands the cashier exactly 2.73. But the cashier doesn’t take it.)

Friend: “Here you go.”

Cashier: “This isn’t enough.”

Friend: “What do you mean. You said it was 2.73 and I gave you 2.73 exactly.”

Cashier: “Exact change isn’t enough.”

Friend: “What the h*** are you on about. I gave you the exact money. Why can’t I have this drink if I gave the exact change?”

Cashier: “Fine, I’ll cover it this time.”

Friend: *confused face*

Cashier: “Go. Before I change my mind about helping you.”

(My friend was muttering about the cashier all the way back to his house.)