Fathers tell your sons ...

When we are children our elders pass on words of wisdom to guide us through life (although not quite sure how much use 'dont arm wrestle a window cleaner' has been).
To all those chaps out there in your twenties or early thirties there is one thing they didnt tell you... that when you hit 40 the above will become a close, battery operated, friend. Vibrating away you will poke it into openings previously only invaded by a finger and will do so regularly for the rest of your life.
Fathers, dont let it be a shock to your sons. Pass on the truth however painful it may be, they will thank you in time.

For the more childish amongst you there is also this version.