"Claire-a Culpa" is an orchestral piece on the Season 3 soundtrack. It plays at the end of the episode "Par Avion".
In a flashback, Claire visits her mother in the hospital. She apologizes, sobbing, for their angry conversation in the car that led to her accident.
In the present, Charlie reads the note Claire wrote, and they attach it to a seagull's leg. They release the bird, which immediately joins its flock.
Kate, Sayid and Locke, meanwhile, reach the Barracks. They spot Jack fleeing, or so they think. A moment's wait reveals that he is actually playing football with Tom, to their shock.
The piece's first movement is a variation on the theme from Claire's theme. The second movement features the Others' motif, Ben's theme, and Jack's motif.
"Mea culpa" is Latin for "I'm sorry." The title is thus dog Latin for "Claire is sorry."