Have you ever quit a job by walking out before the end of your shift?

Yesterday, a player for the Buffalo Bills retired at halftime to the shock of his teammates.

Have you ever just quit in the middle of the day like that?
If so, did you announce your decision, or did you quietly slip out the door?

http://www.espn.com/nfl/story/_/id/24703207/buffalo-bills-cb-vontae-davis-abruptly-retires-football-half-vs-los-angeles-chargers