Pa tells Ma one morning that the drop dunny is getting full, but he's too old to dig another and they can't really afford to pay someone.
Ma says to talk to that young Ron that just bought the next farm, he went to uni she says. So Pa asks Ron, who says to get 2 sticks of dynamite. Cut one fuse short, light them both, throw them down the hole, and run back to the house. The first stick will blow the dunny up in the air, then the 2nd stick will blow the contents over the paddock for fertiliser, and the dunny will drop back into position
Pa does this the next morning, however Ma runs out to the dunny as soon as Pa gets near the shed & safety. He yells at her to get away, but it's too late.
The 1st stick blows the dunny up into the air, with Ma inside,
then the 2nd stick blows everything out all over the paddock, JUST like Ron said it would...
Pa runs over to check on Ma. She staggers out and says "Bloody good thing I didn't let THAT one go in the kitchen".