Why it worked
The humor comes from the juxtaposition of a grumpy, adult-like Spongebob character with a baby, and the exaggerated, comical dance moves create a visually engaging and funny scenario.
Summary
A baby stands next to an animated, grumpy-looking Spongebob Squarepants character. The Spongebob character performs a series of exaggerated, comical dance moves and gestures, seemingly interacting with the baby.