No we are not. Carry on with your denial. You are ignorant.
You are mistaken. As BeAStooge (one of the most knowledge Stooges scholars on the planet) has already told you, there is no such scene with quicksand in any of the Three Stooges shorts or film appearances. The closest to what you describe is the scene in We Want Our Mummy
that Dog Hambone mentioned, and that's only a few seconds long.
I'm not sure what film you might be thinking of, however. The first thing that came to mind was Blazing Saddles
, but I doubt that anyone would mistake Cleavon Little for one of the Stooges, and you've already ruled out Abbott and Costello. Maybe the Ritz Brothers did a bit like that in one of their films? (I'm not a big fan of them, so I don't know their movies very well.)