Came close to that with my GM Card, I think when HSBC still handled the account. Went to Texas for work and I wasn't using my cell phone much so I never gave the number out, so when they saw the hotel charge hit they called my home phone. Never got an e-mail for some reason or I'd have caught it that way. Somehow, they figured it out and I didn't have a problem checking out, but there were two messages waiting for me when I got back. That put me in the habit of letting the issuer know.
I also got in the habit of calling before large purchases to make sure they knew it was coming. I remember talking to one rep and started the conversation saying there would be a large charge coming through and I didn't want their computer system to freak out. I told her the amount and she said that she'd be freaking out too

. It was for bodywork for hail damage on my car. Got to the shop, ran the card, and no problem.