I thought you were referring to the "Winner!" ad that was run a while back. That was one obnoxious ad, and once we found out about it, we had it pulled.
The Expedia ads, although animated, are pretty tame by today's advertising standards.
Unfortunately, those "short" pages, such as the "Thank you for adding to the topic..." transition page, are short enough to show both ads at once. Same with a new thread page that only has one or two posts...