To be fair, I did find this humorous. Sadly it was way too short for my taste. While he was falling down the stairs you could have expanded on why it was making the sides of the building fall apart and then ultimately the building itself.
The graphics were nice and make me think of MistyEntertainment's art style but more cartoony. Maybe could add some voices if you ever revisit this piece with the employees being shocked at Gaben's bad behavior and maybe a mythology gag about how he can't seem to count to three and trips on the third step.
The sounds were fitting and kept this piece humorous. However, given it's really short there isn't much time to make full use of more funny sounds revolving around Gaben falling all the down.
Overall, this was pretty funny but at the same time a bit too short. Nicely done, nonetheless.