Also, don't periodically stop to scream "Shut up, bitch, I'm on the phone!" to someone in the background.
Oh god, this reminds me. When I got a phone call offering me a job (basically a call from HR) the kids I was nannying decided to start WW3 the second I picked up the phone. There was a barking dog, screaming children, tears, blood, name-calling, the crash of furniture, doors slamming, the whole deal. It was just GREAT.