Tom Calls / Cat Calls
I love the part when Gene Kelly goes walking across the lot, and a bunch of girls whistle and call out to him, as they watch his very finely made bottom go walking past them in those little, white, sailor pants.
I have never really understood the fascination with bottoms, but I must say, if I had been among those girls, I think I would have been compelled to do the very same. He did have a nice one.