Have you ever negotiated interest rates with your credit card company?

I find it interesting that other PF bloggers have been calling up their CC companies and asking for a lower interest rate. Before I started blogging, I had no idea you could even do that! Does it work like that in Canada too? I don’t carry a balance on my credit cards, but for some reason I have a major urge to call up my CC companies and ask for lower interest rates. Am I crazy? I mean, why should I even bother? What I should have done was call them up while I was still in debt, but since I’m an idiot, the thought never crossed my mind until now.