Client: I want all cookies blocked on my computer.

Me: Are you sure? Some things won't work if i do that. Like using online banking.

Client: I don't use it, so it's fine.

*Two weeks pass. I have to come back and see three bankcards laying on the table*

Client: I'm not able to use online banking anymore. Can you fix it?

Come on! You pay me to give advice and help out with problems. The least you could do is listen.