Digital impossible!
Here are some old fashion animation that could only achieve by traditional hand-drawn technics.
The requirement were short duration of animation that could be used repeatedly. Most of these were found in the cycle animation of special effects.

Cycle animation were mimic animation technics, which manuipulated by man-made physics theories to convince into belieable non-stop animation.

Unlike, computer dynamics, it's calculated with dynamics physics theories which doesn't have the capability to fake the dynamics into a non-stop animation.

Here are some of my collections shown on the right. Please post your feedback for my attention.