Conventional wisdom: Begin potty training when your child shows signs of being ready, such as asking to go to the potty.
Amy wisdom: If I say, "Tinkle? Potty?" Mommy will let me go upstairs, where I can refuse to have anything whatsoever to do with the potty. But I am upstairs. Which is exactly where I wanted to be. Score: Me - 1, Potty training - 0.