He explains it all here (may be old)
www.chrispackham.co.uk/Smithswatch_09.htm
(Slurpy J, Wed 1 Jul 2009, 2:04, Reply)

I noticed he missed the obvious one
'that's what she said!'
( Noo_Noo Is now 'BeerElf Jnr', I guess :), Fri 3 Jul 2009, 23:29, Reply)