Marty, it's impossible. The idea that I could fall in love at first sight is romantic nonsense. There's no scientific rationale for that concept.
10 seconds sound clip from the Back to the Future Part III movie soundboard.
You can hear this line at 00:37:00.185 in the DVD version of the movie.
Quote context
[...]
- Well, we just got word she's coming in tomorrow.
- Here are the details for you. Thanks for all your help.
- Oh! Her name's Miss Clayton. Clara Clayton.
- Well, Doc, now we know who Clara is.
- Aw, come on, Doc. It's not science. You meet the right girl, it just hits you. It's like lightning.
- Marty, please don't say that.
- That's the way it was for me and Jennifer. I mean, we couldn't keep our eyes off each other.
- Don't worry, Marty. She'll be fine.
- When you burned the almanac in 1955, the normal timeline was restored.
[...]