"I enjoyed the movie very much. I was just wondering, did you ever consider having more horses in it?"
"Well, we would have liked to. But it was difficult, obviously, being set in outer space."
or
"Do you have any books by Dickens?"
"No. No, I'm afraid, um, we're a travel book shop. Er, we only sell travel books."
"Oh, right. How 'bout the new John Grisham thriller?"
"Well, no, 'cause that's a- that's a novel too, isn't it?"
"Oh, right. Have you got Winnie the Pooh?"
"Martin! Your customer!"