Comedy film of woman falling from air duct onto trampoline

I remember a scene where an overbearing mother was trying to spy on her kids and their friends in their room or something and she cl imbed through an air duct inside the wall (avoiding rats and the like), then she fell back down through the duct and broke her fall landing on trampoline which she bounced on a few times. It was a comedy film. Sadly this is all I can remember. Can anyone help. What was the name of the film?