From Léon: The Professional.

Mathilda: Leon, I think I’m kinda falling in love with you. It’s the first time for me, you know?

Léon: How do you know it’s love if you’ve never been in love before?

Mathilda: ‘Cause I feel it.

Léon: Where?

Mathilda: In my stomach. It’s all warm. I always had a knot there and now… it’s gone.