Early examples of a film featuring fast food?

In one of Buster Keaton's short films (I believe it to be Three on a Limb, 1936), Keaton's character visits a drive-in food place. He orders a hamburger and malted milk. The food is served on a tray which connects to his car door. I may be wrong, but this seems a lot like fast food to me.

I'm wondering if anyone could name some early examples of a film featuring fast food or something resembling it?