Can I Help You?

An older, overweight, probably Assyrian guy comes to my register. We make eye contact briefly, because he is only a little taller than me. I say,
"Good morning."
"Can I help you?"
"Can you help me? I was going to ask you that."
"What can I help you with?"
"You can't help me with anything. You are at my counter. Can I help you with something?"
"You want to help me?"
"Not particularly, but you are at my counter. Did you need something?"
"Yes. A pack of Marlboro Lights 100's."
"Ok then. Marlboro Lights 100's. Here you go."
What the hell was that? Was he trying to play mind games with me? This is my damn counter. 'Can you help me?' Can I help you, dickwad? Thus began my morning.