I have no account to add it but wanted to add: "When they come in five minutes before closing time to spend fifteen minutes making a mess and then buy nothing."

That pisses me off so much!

Also, complaining about the price of things (like waterproof coats) that are designed for people who venture up mountains and across ice sheets, not for going to the bloody shopping centre!

You need an account? I didn't think you did...

That's a good one though!