Not a great comedy, but it has its moments, and part of the fun is spotting the references to Hitchcock movies. Most of them are completely obvious, but there’s some more subtle ones, such as Marnie.
There was one scene that was a genuine comedy great moment though, when the nurse and the evil doctor are being shot, verite, from under a glass table, and they keep putting things on it, forcing the camera to keep moving. That was rather an excellent idea.