"Congratulations"

Twice this evening I have been in the middle of a search, adding filters, when I've been interrupted by an American woman congratulating me on being chosen to win an i-phone or something - a Windows promotion of some kind.  I don't want to click on OK to enter, I just want to get on with what I was doing, so I click at the very top of the page and lose eBay altogether and have to sign in again.  Anyone else had this problem, and got out of it without losing what they were doing?