Many Christians do this whenever they feel threatened by someone who opposes their beliefs. This is not a publicized practice, as many Christians will even deny it's existence.
The "act," itself, usually involves a ritualistic killing involving a crucifix being inserted into one's heart, so that Jesus may fill their soul with the power of Christ.
Susan - "You know what Pastor Joe says to do, right?"
Jim - "What?"
Susan - "We must offer him up as a Sacrichrist.."
Jim - "Sounds good to me!"