[Sparkologist]

Mum and dad were taking young Billy for a walk through the park one sunny afternoon when all of a sudden, in the bushes a short distance away, Billy spots two dogs going at it. 'Daddy, what are they doing?' asked young Billy.
After some quick thinking, the father replied, 'Why son, they are making a puppy.'

Later that night, Billy was thirsty and got out of bed for a glass of water. As he walked by his mum and dad's bedroom, he heard a noise, and poked his head around the door to take a look, only to find mum and dad going at it. Billy shouts, 'What are you doing?'
The father, quite embarrassed, replys, 'Why Billy, we're making a baby.'
'Quick, turn her over...' declares Billy, '...I want a puppy!'