Мультфильм “Волк и семеро козлят” - “The Wolf and the Seven Little Kids" Cartoon, Russia, 1957
The origin of the “It’s pizza man! With a pizza!” gif. The source footage is found at 3:03. I’m fairly certain he isn’t talking about pizza in Russian, unfortunately.
I found this by taking a screenshot of the gif and doing a reverse google image search. If you’re curious about the origin of context-less or uncredited video stills circulating on tumblr, this method works quite well.