That is really irritating!
While making a quick reply to a post in the rafting forum, the website kept bumping me up to the top of the page so that I could see the ad there. I didn't want to see the damned ad. I wanted to write a quick reply. But every few seconds, I'd get bumped back to the top. Scroll down, get half a word typed, and get bumped back to the top.
Come on, guys. That just sucks.