My favorite reply to "You cancelled MY flight!" during crazy weather days is (with a big smile and a voice sweet as pie) "Oh, I'm sorry, I wasn't aware we were operating any charter flights today! Please step to the back of the line and the next available agent will assist you with your rebooking."

I also love, "Can you transfer me to another airline?" and again, with a big smile, "Sir, I believe it is also snowing over American, Delta, and Northwest, so I'm pretty sure the weather is an issue for them as well."

Gotta love the crazy passengers we deal with on a daily basis...