More little Johnny?
Little Johnny walks in and catches his parents having sex. LJ runs from the room bawling. Dad sits down and explains that they were making LJ a baby brother in mommy's tummy. LJ is happy.
Next week dad comes home from work and finds Little Johnny sitting on the front porch bawling again. Dad asks what's wrong. LJ says "You remember the little brother you and mommy made in mommy's tummy? Well, the damn mailman came by while you were at work and I think he ATE IT!"