THE SCENE: Last Saturday, upstairs in Blair's office. Blair is happily typing away at his laptop when I fling myself into the chair beside his desk. It's a few minutes before I leave for my long run and I know Blair is heading into town later that morning for a haircut.

"What phone are you taking today?" I ask. "Your blackberry or cell phone?"

"I don't usually carry a phone with me on the weekend," said Blair.

"I know," I said. "So my question is, which one will you be carrying today?"

"Ah. I see," he said.