Please share the scar story, you poor dear. I hope that you are not subconsciously trying to bang yourself up to the Goog's level so that you have more in common...facial deformity wise.
Depending on the crowd, you can go with a "Refused to deny my Lord and Savior to the North Korean Officer when I mistakenly went over the DMZ", to "Hit my head on the Principal's desk, but you have to do what you have to do in this crazy economy, raise wise!"