['I tripped the other day on a stair becuase one was slightly higher than the others.', 'Oh no, are you ok?', 'Yea im fine but it was quite an embarrasing and frustrating situation.']
I can imagine, perhaps it's a good way to get someone to fix the steps?
I tripped on the stairs of a subway because one stair was higher than the others and I got quite angry at it.