She is impossible to please !!!

First clerk	I've just had a terrible hour and a half.
Second clerk	Why, what happened ?
First clerk	Well I had a lady customer come in who wanted to buy a pair of shoes. And you know we've got a really good range.
Second clerk	We certainly do. Did she buy a pair ?
First clerk	No, but she didn't leave before getting me to bring her every single pair we had in the shop. And she complained about every single one.
Second clerk	I'd say she was impossible to please.