Torture
You put your fingers in the coffin to tickle the beggar inside. What you're doing is a new form of torture.
First, you put them in a coffin to make them think they're going to die. Then you tickle them with your fingers. There is no greater psychological + physical torture than this.
ごう
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The beggar you will coffin tickle torture is none other than old Grandpa ごういち. He is a frail old man, and doesn't like to be tickled.
He keeps screaming: "STOP THIS TICKLE TORTURE. I CAN'T TAKE IT, JUST BURY ME."