For a laugh, you could do either "You Could Drive a Person Crazy" or "Sing For Your Supper."
I've done both (dressed as "three guys" not in drag), and they went over well.
If you want something a little more operatic, there are the over-the-top Italian tenor trios from "The Most Happy Fella"---"Abbondanza," and I forget the other one...
"Jaws is the Citizen Kane of movies."
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