Here's a funny and sexy ad parody from the 1982 sketch comedy show O.T.T. (Over the Top).
The two guys are wondering if "she is or if she isn't" as the girl walks towards them. It turns out they are talking about her panties. When her skirt gets hooked on a tree branch they discover "she isn't" and they chase after her.
In the second round they are still wondering, but this time "she is." However, they aren't and chase after her again.
Clips can be found here:
http://www.youtube.com/watch?v=PeZ2Q...5c9jai&index=4
First one starts at: 16:00, second one at 21:30.
Enjoy!