Dance scene
Although very good, the best dance scene I have ever seen was between Kim Novak and William Holden in Picnic. He was 37 and she was 15 years younger. Holden didn't want to do it because of the age difference. But that was the point, he played a man who had dissipated his life and returned home and she was engaged to his friend.
You can find copies on You Tube
I don't know everything. Neither does anyone else