Aha. L'amour.

3 seconds sound clip from the Play It Again, Charlie Brown movie soundboard.

You can hear this line at 00:14:15.231 in the DVD version of the movie.

Quote context

[...]

- Look out, everybody. I'm gonna be crabby for the rest of the day.

- I just don't know what to do. I've tried everything and I can't get Schroeder to notice me.

- Here comes Peppermint Patty. She always seems to come up with answers to problems. Maybe she can help.

- Hi, Sally. Hi, Lucille.

- Lucille?

- What's with you, Lucille? You look down in the dumps.

- Oh, she's trying to get Schroeder to pay some attention to her.

- Aha. L'amour.

- He's the kid who's always banging away at the piano, right?

- That's him all right.

- Hey, listen, Lucille, I think I can solve your problem, and you can help me at the same time.

- The PTA is giving a big benefit and I'm supposed to line up talent.

- Tell you what, I'll fix it up so Schroeder gets to make his professional debut.

[...]