The cashier was looking at him ... also waiting . She looked at me , looked back at him , and then back at me . What passed unsaid between us was " what 's this guy 's problem ? " .

Question: Why are the cashier and customer exchanging looks ?
Answer: The customer is empathising with the cashierThe customer is bored with the cashierThe customer is flirting with the cashierThe customer is angry with the cashier