a 5 gallon bucket. Poke two holes at the top. Stick a small rod at the top that goes through the holes and also stuck it through a soda can. The soda can should spin.
You then fill the bucket about halfway with water. Stick some peanut butter on the soda can. Provide a ramp up toward top of bucket.
Morse goes up ramp, tries to get PB, can spins, mouse falls into water and drowns.