1.) If your a backseater, wait until the driver gets off the line of code to yell at him for a typo
2.) When you're pairing, change your IM status to "Pairing with Bob" so your wife doesn't IM you with embarassing terms of endearment.
3.) If you want me to pair with you, I really, really want you to have ReSharper & TestDriven.Net. VS2005 is basically naked without.
Luke Melia adds some more points here.