Here is another great cartoon for Valentine's Day (or any other day), starring the dynamic duo of "toondom:" Tom and Jerry. This is my favorite Tom and Jerry cartoon from 1946, where Tom falls in love with a cute girl cat named Toodles. In this short, Jerry peered by the spirit of jealously forges a letter laced with perfume (supposedly from Toodles) to an alley-cat named Butch to break-up Tom's romance, so Jerry could selfishly have his "frenemy" back.
I don't have any particular scene that I like because I love this cartoon, and I love how Toodles is designed. So that is all I could say about this cartoon.