Buses full of mice? Must be a Terrytoon!
Here’s a gag from “Popcorn” (1931). A bus full of mice runs over a chicken in the road. The accident leaves behind some eggs. Another bus full of mice runs over the eggs. They hatch and start dancing in time to the xylophone music.
What any of this has to do with popcorn, I don’t know. Thanks to Jerry Beck for posting a nice old British print of this cartoon.