Sometimes, despite the characters' tin ear for humor, the show decides to get funny. Lighten things up.
People get kind of funny silly.
They drop things. So whenever it's supposed to be kind of funny silly embarrassing, we hear the funny silly embarrassing music. It's kind of like in those old grade school nature films. B-doinky doinky doinky doink, says the music. Lily is whiny and childish and annoying.