The scene everyone knows is Superman and Lois flying together in Superman I, with Lois being held totally improbably. Of course, I suspect many of us don't pay too much attention to that moment because we're finding the mute button to turn off Margot Kidder's internal monologue.
But those same words sung to that melody is a great song. I like to sing it myself, albeit with the gender stuff changed suitably since I'm a straight guy.
BTW, does anyone recall who sang that on the released single?