Christmas Moon 2007
Did you know that Canon has a hidden function for christmas eve? In the custom functions you will find the menu entry C.FnV: Santa Mode --> 1:On 2:Off !!! By default this function is turned off and you can turn it on only at christmas eve.
I found this by accident when taking pictures from the christmas moon yesterday with my old EF 135-300 lens. All you need is some luck, or the information when Santa is on the way to your home :-)
Check the NORAD Tracks Santa Operations Center and you will know it :-))