Pretty good...
Pros: Good idea. I started laughing after the second ad, and the ending was pretty neat. I think you used the idea pretty well. The movement of the characters was also realistic a lot of the time.
Cons: Some of the animation needs work, like when the guys rubs his chin or the lady first comes up the stairs. In fact, the animation seems to get better as we progress through the movie.
The sound effects weren't the best, but that wasn't much of a problem.
Overall: 9/10 for pros and 7/10 for cons. Average = 8/10. Keep the animating up.