You eat the brain of a wolf.

You drink from the paw print of a wolf, or drink out of a pool of water that wolves have drank out of.

You eat roasted wolf flesh.

You wear or smell the plant wolfbane.

You have tasted human flesh.

You wear a garment made of wolf skin.

You wear a belt made of the skin of a executed criminal.

You are bitten by a werewolf.

You are born on Christmas Eve.