This reminds me of my first Christmas water-globe, which had a Santa Claus and snowflakes. But now you can play it more often since it is integrated with an optical mouse.
In the mouse, the fish or the duck will swim as you move the mouse. The Santa Claus version of USB optical liquid mouse supports Windows Vista, XP, 2000, ME, 98SE and MacOS.
The amazing measures only 11.5 x 6.0 x 3.5 cm and weighs 123g. You can this cute looking optical mouse for $17.00 at the USBGeek.
Image: Bizz n Tech