I'm thinking of laughing at the woman when she trips in the street.
Are you serious? Why would you laugh at her for tripping?
That kind of thing is funny when it happens to somebody else.
It's wrong to laugh at a person for an accident that could happen to anyone. You're going to cause her a lot of embarrassment if you laugh at her. Offer to help her instead or just pretend like you didn't see it happen.
That's too much work to offer help. Laughing and embarrassing her is effortless and more efficient.
It's awful that you would think her falling down is this funny. She could have seriously hurt herself.