Your father kissed me for the very first time on that dance floor. Lt was then that I realized that I was going to spend the rest of my life with him.

13 seconds sound clip from the Back to the Future movie soundboard.

You can hear this line at 00:17:01 in the Blu-ray version of the movie.

Quote context

[...]

- Anyway, your Grandpa hit him with the car and brought him into the house.

- He seemed so helpless, like a little lost puppy, and my heart just went out to him.

- Yeah, Mom, we know. You've told us this story a million times.

- You felt sorry for him, so you decided to go with him to the Fish Under the Sea dance. No. Lt was the Enchantment Under the Sea dance.

- Our first date. I'll never forget it. Lt was the night of that terrible thunderstorm, remember, George?

- Your father kissed me for the very first time on that dance floor. Lt was then that I realized that I was going to spend the rest of my life with him.

- Hello. Marty, you didn't fall asleep, did you?

- Doc. No. No, don't be silly.

- Listen, this is very important. I forgot my video camera. Can you stop by my place and pick it up on your way to the mall?

- Yeah. I'm on my way.

[...]