After buying the bank of Heaven ghost money..
I started to wonder about the signatures: Yin Low (judge of the Underworld) and Yuk Wong (Jade Emperor) previous post.
At YouTube I found a series of four films showing of a man 'being' a tua ya pek, being possessed by a guardian of the Underworld.
It starts off with Chinese dragon and lion dances.
I think the location is Singapore?
Then the guy who is to be possessed gets dressed and drunk...and is both grave, gentle and impressive as he swaggers around handing out sweets and blessings.
He is also called upon to lacerate his tongue.