Ok, what "games" do people play with themselves to help pass time on the trainer? Looking for some good innovative ideas here. I figure if we can come up 50 or so, most of us can probably make it through the winter trying something new each time.

Some of mine are,
Seing how long I can hold the same EXACT heartrate
Seing how long I can hold the same EXACT cadence
Seeing how long I can go without looking at the clock (its hard has hell actually)
Heartrate intervals
Watching movies (music doesn't help me for some reason)
Playing out the those brilliant "The Knave" and "The Look" scenarios in my head
http://www.bikeforums.net/showthread.php?t=140122

Any others?