Peanuts in just about full form.
Snoopy is merely pretending to be animals -- such as snakes -- and dancing about in mirth, still. But Lucy is authoritatively telling Linus a lot of nonsense, ineptly attempting to flirt with Schroeder, and deriding Charlie Brown and then changing the subject when he disproves her claims. A long sequence when Charlie Brown is a Davy Crockett fan much as Schroeder is a Beethoven one. And more.