Buttons

The following conversation happens in G's car.

F: I keep losing buttons in my colleague’s car.
G: Why?
F: Whenever I take the front passenger seat, the bucket seat always rub against my butt and took the left pocket button off.
G: Oh, I see.

F: (Checking all her buttons) I better not lose anymore buttons.
G: What’s wrong with losing buttons in my car?
F: …