Sense of humour failure

The opportunity presented itself so well in my local Tesco this afternoon, I thought I'd give it a go.

I couldn't see what I was looking for, so I asked an employee: "Excuse me, do you have chestnuts?"

And without batting an eyelid, he replied "Yes, they should be on the shelf over there."

I ask you - where do they get these people from?

(Mind you, it was only after the moment passed, I realised I should have replied, "Doesn't that hurt?")