"Do you like light or heavy reading?’.....must read

Customer: ‘I’d like to buy a novel, please.’
Bookshop assistant: ‘Certainly, madam. Do you have the title or name of the
author?’

Customer: ‘Not really. I was hoping you could suggest something suitable.’
Bookshop assistant: ‘No problem. Do you like light or heavy reading?’
Customer: ‘It doesn’t matter. I’ve left the car just outside the shop.’