High school algebra teacher leaves school to become backup quarterback for one NFL game.

Granted, Jon Kitna used to be an NFL quarterback a few years ago before he retired. Now, after seamlessly transitioning into an algebra teacher career, he's leaving his teaching job briefly to go back to the NFL, if only for one game.

Why?

The starting quarterback for the Dallas Cowboys, Tony Romo, injured his back and is out for the last game of the season. The Cowboys' backup will start this week in Romo's place. That means there's no backup to the backup should the backup become injured this week. You follow?

Cue Jon Kitna, who once played for the Cowboys a few years ago and vaguely remembers the playbook. Should a worst-case scenario happen this week, the now 41-year old algebra teacher can step in and play quarterback.

Kitna will earn $53,000 acting as the backup for one week, a salary he says he'll donate to the school he works at.

In case you're wondering, the minimum salary a Texas teacher can earn with 20-years of teaching experience is $44,270.

Jon Kitna will earn nearly $9,000 more than that for 3 hours work on Sunday.