A young man goes home from a war to see his mother in the country.
She’s never left the country and has never seen anything like her son’s uniform or gun. He shows his mother both items, then she asks about the grenades on his belt. He says, “Well, you pull the pin and throw it.”
She still doesn’t quite get it, so he decides to demonstrate and throws it into the backyard.
The outhouse blows up and his mother cries, “Oh no! Your father was in there.”
A few moments later, out crawls his father, covered in dirt. He looks over at the hole and says, “Geez, good thing I didn’t let that one off in the house.”