[Tottanka]

HM..
Considering previous year's hints we surely know dave is a hippy.
SO, that picture gives us diamonds, with a shiny background.
There's a PinkFloyd very famous song named:" shine on you Crazy Diamond", might be it....
the song also has 2 parts, 1 to 5, and 6 to 9...might also be a clue...
here's the lyrics of 1 to 5:
Remember when you were young, you shone like the sun.
Shine on you crazy diamond.
Now theres a look in your eyes, like black holes in the sky.
Shine on you crazy diamond.
You were caught on the crossfire of childhood and stardom, blown on the
Steel breeze.
Come on you target for faraway laughter, come on you stranger, you legend,
You martyr, and shine!

You reached for the secret too soon, you cried for the moon.
Shine on you crazy diamond.
Threatened by shadows at night, and exposed in the light.
Shine on you crazy diamond.
Well you wore out your welcome with random precision, rode on the
Steel breeze.
Come on you raver, you seer of visions, come on you painter, you piper,
You prisoner, and shine!


Lyrics of 6-9:
Nobody knows where you are, how near or how far.
Shine on you crazy diamond.
Pile on many more layers and Ill be joining you there.
Shine on you crazy diamond.
And well bask in the shadow of yesterdays triumph, and sail
On the steel breeze.
Come on you boy child, you winner and loser, come on you miner
For truth and delusion, and shine!

EDIT: i thought of it a bit, and found some really interesting stuff in that lyrics...
Diamonds are actually the srtongest substance ever found, so maybe it will be a really aggresive game with ramming allowed..
Someone has already mentioned hockey..i say Football is also an option, a very exsiting one as well...
ALso' a diamond is beeing mind from under the ground, so maybe it also has something to do wiht the hint...
another thing, a diamond is a very special Optical object wich refleccts light in many interesting ways...im thinking CMUcam2 will be here again thi year?