Funny movie from the 80’s – scene

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Hello,
I searching for a scene in an American movie I can’t remember which,
But it goes like this:
A woman listen to a wrong phone call for her and thinks she hear instructions from someone about how to loose weight – she needs to run on a highway with butter on her a**, and how much to rub it on before.
On the other scene she looks tired and is running on highway to loose weight.

That was funny how I remember it, but I can’t remember the movie’s name, actors and find the scene on the internet.

Thanks

Filmfind Changed status to publish May 17, 2022