Is it something called “schadenfreude”? Apparently that feeling comes from the situation subconsciously showing you that you’re not as much of a failure in life as the next person is (lack of better words, sorry).
No one wants to admit feeling it, but it’s completely normal. But notice you wouldn’t laugh at a poor old man that fell and hurt himself, but for a younger guy that falls and will get up alright...it’s different.
However there’s a line between this and being a complete sadist: taking pleasure in that person’s suffering and not just their relatable situation