I sometimes think that God, in creating man, somewhat overestimated his ability. Oscar Wilde
Among the most sacred gifts you can give your child is the gift of health. This gift is best given by example. Dr Rand Olson - 'Children of Promise: The Ultimate Guide to Raising Healthy Kids'
OK, so you asked for a dad joke:
Why couldn't the pony sing a lullaby?
It was a little horse.
I'll see myself out...