My Catholic mother-in-law had 6 boys, and precious little help controlling them from their dad. One night (when they were still young), she was at her wit’s end with their squabbling. So she went outside to the freshly dug up septic tank, poured gasoline into it and lit it. She went back inside and told them the devil was on his way up to get them, just look outside.
The boys never forgot that, and laugh about it today. They turned out OK, too.
"That's the second biggest flaming bag of poo on the doorstep I've ever seen!"