OK, try this one.
Michaelangelo's statue of David. You know the one, somewhere in Italy? If you look closely, actually very closely, you'll notice something unusual about this statue.
David has got a very, very, tiny willy!
Now for the interesting bit, wherein lies the question. No searches please, cos that's cheating, you have to work this out for yourself.
Here we go. Scientists believe that the depiction of David is absolutely accurate. Moreover, they declare that David's tiny little willy is a spot-on replication of how David's willy would have looked.
But why would David's willy have been so tiny?
The first correct and complete answer wins a tube of Smarties posted to anywhere in the world.