Falling UP the stairs used to happen while I was in the military. I never fell, but some guys fell up 3 flights! They usually only did that once...
I once owned a house built in the late 20s. The stairs were just a little bit shorter than the standards adopted later. For awhile, those were the only stairs I used to I became used to them.
Then I took a job at a bank ops center in a 3 story building with those stupid slow-as-molasses elevators that the seem to put in everywhere these days. Taking the stairs was the only way to get anywhere on time. I don’t know how many times I tripped because I didn’t lift my foot up quite enough to clear the higher steps in that building. Took a long time to get used to them.