A small boy walks into his mothers room and catches her topless.
"Mummy, mummy, what are these?" he says, pointing to her breasts.
"Well, son," she says, "these are balloons, and when you die,
they inflate and float you up to heaven."
Incredibly, he appears to believe this explanation and goes off
quite satisfied.
Two days later while his mother is making tea, he rushes into
the kitchen.
"Mummy, mummy, Aunt Mary is dying!"
What do you mean? says his mother.
Well she's in the garden shed, lying on the floor.  Both her
balloons are out, Dad's blowing them up, and she keeps yelling
"God, I'm coming! I'm coming!!!"