> A common example to help explain sunk costs is the movie theater experience, where a person buys a ticket and, 20 minutes into the movie, she realizes that it is a horrible movie and it will only get worse.

Offtopic I know, but twice in my life I've walked out of a terrible movie at the theater within the first 30 minutes and gotten a refund from the manager. Don't think you have to sit through terrible movies!