What's your favourite, Spankling?
I like the old chestnut:
Q - What is the difference between a truckload of babies and a truckload of bowling balls?
A - You can't unload the bowling balls with a pitchfork.
...and the slightly less well-known...
Q - Why do babies have softspots in their heads?
A - So you can carry them around ten at a time.
Your favourites?