Uncharacteristic Behavior

What happens when you've created and written a character who is so thoroughly realized that he or she is always, well, in character? This week, write a scene in which your character is caught doing or saying something shockingly out of character. What event or realization has caused this atypical behavior, and what is your character's response to being confronted about it? Will the consequences be immediate and dramatic, or gradual and subtly psychological?