Lets play a game. The rules are that you can do anything you like so long as it upsets the client. The winner is the first lawyer who can cause the client to yell at a law firm employee, or email you in ALL CAPS. Don't forget - the client is on your side because you’re on their side. They want you to win. When they get angry at you, especially when they’re willing to say it to your face, that’s quite an achievement. It’s a bit like complaining to the dentist while they’ve got the drill in your mouth. Making a client angry enough to speak up is quite an achievement. If you’ve pulled it off then you’re doing something really special.