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1.
Anything that is so crazy bad that it cant be classified as just 1 of the origninal 7 deadly sins..

Things such as chewing off a siblin's head, kicking the Pope in the sack, punching a baby. Something really really crazy.
Why is your brother in jail?

He chewed off our sisters head....

Ah, an 8th deadly sin... Sorry for your losses..
by Catholic Preist August 20, 2011