I guessed that about throwing pebbles in the lyric! Glad to have it confirmed.

I feel as if the song "That's how you get the girl" is basically instructing the guy to behave like the Romeo-boy in "Love Story" (a song I love--have I said so? The first time I ever heard it, I had *no idea* how it was going to end--I thought it was maybe going to be a song about a relationship that went south. And then it ended with a happily ever after! I cheered.)