Perhaps If You're Flash Gordon

I was watching Cube 2 a couple of days ago and, although it was by no means the worst part of the film, there was one particular bit of dialogue that irritated me. One character said, "I'm assuming..." and another interjected with "Well, you know what they say about that," or something to that effect. Now, I don't like the phrase being referred to at the best of times, but in this case the implication is that it "makes an ass out of U and ming", which isn't the most meaningful phrase I have ever heard.