Lady phones up.
"I saw your advert... Are you interested in books?"
Resisting the urge to make sarcastic replies about hating the damn things, I tell her that it depends on the books and ask what sort they are.
"Ohh I don't know"
"Well what Subjects"
"I don't know... all sorts"
"Erm, hardback or paperback ?"
"I don't know"
"Well how old are they?
You know what's coming "I don't know"
At this point, I have got a little bored, so I tell her that they are not really the sort I can sell, and that she should probably give them to a charity shop.
"So are they not valuable then ?"
I can't resist it.. I have to answer with "I don't know".