Rocks

Once upon a time
There was a rock
The rock splits into two rocks
One rock is called "A" another is "B"

"A" came up to "B" and told "B" how ugly "B" was
"B" was frustrated with "A" but he didn't tell "A" about that
"B" went off and invented an explosive, which was later known as "MOLOTOV Cocktail".

"B" came back to "A" and plan up some prank for "A".
The prank is, when "A" speaks, "B" stuffed the "MOLOTOV Cocktail" into "A"s mouth
And when that happpen, the Molotov Cocktail is supposed to explode, because "A" itself is a rock.

When it exploded, "A" split into a couple more rocks, which are uglier than "B"
Those are "A"s kids.

"B" rolled back home with an evil smile.