In winter, I tend to walk more on the treadmill than outside in the sometimes kneedeep snow. This almost always incites a round of the Treadmill Game.
The goal of the game is to get me to play fetch with my dogs, Tawny and Hunter for the entire 45 minutes I'm walking. Their plan of attack is two fold:
1) Sytematically hold toys just out of reach near the front, so I must lean over while walking to grasp them. If toys are not grasped in a reasonable amount of time, they are dropped, becoming hurdles to step over before they trip me up.
2) Attack the moving "floor" with paws, sometimes holding them in place against the rotating belt, effectively making a noise like the metal against grinding wheels in the fabrication shop where I work.
Needless to day, the plan of attack usually works :)