As Dave kindly pointed out in a comment, I am the "blank one". However, while my mind is often a blank, and I'm sure blonde jokes were written with people like me in mind, that's not how I got that nick name.
It actually comes from my dad. He used to call me casablanca (kazza-blanka), derived from my name. Blank-one was a derivation of the blanca part. So he'd call me kazza the blank one.
And so a nick name was born :) And a pretty unique one too I might add.
Dave2
The truth at last.
When I first started reading your blog, I searched through past entries to find out about it, but eventually gave up thinking it must be some obscure Australian reference. Now I know.