That's the Florence Nightingale effect. Lt happens in hospitals when nurses fall in love with their patients.
6 seconds sound clip from the Back to the Future movie soundboard.
You can hear this line at 00:56:49 in the Blu-ray version of the movie.
Quote context
[...]
- Shape up, man. You're a slacker. Do you want to be a slacker for the rest of your life?
- No.
- What did your mother ever see in that kid?
- I guess she felt sorry for him 'cause her dad hit him with the car.
- I have been looking all over for you.
- You remember me, the guy who saved your life the other day?
- Good. There's somebody I'd like you to meet.
[...]