Whenever Phineas J. Whoopee goes to an overloaded closet for his 3-Dimensional Blackboard, assorted items cascade out and bury him. This running gag was probably inspired by a similar gag from the classic radio comedy "Fibber McGee and Molly".
This show was produced at the same animation studio as The Bullwinkle Show (1959) and other Jay Ward cartoons. Many of the same animators who had previously worked on some of the Jay Ward cartoons worked on this. Since the animation styles are extremely similar, it is often packaged in syndication with the Jay Ward shows.