Solid concept, execution could be improved.
for one, it's clearly too short. The animation could always be better. But it's funny.
If you were going to re-do this, my suggestion would be to milk the gags for as long as possible. Don't just make the person go from vertical to horizontal when they fall, make it take longer, and make them twitch or try to get up and fail.
Because really, who doesn't like laughing at old people?
4/5
~Qwerty