Vibrobot from old camera

Step 6 GO!!

Put it on a flat surface and watch it scuttle around. If it is biased toward a direction (in this clip it tends to turn left) try to straighten the inclined part. The straighter it is the more erratic it tends to be since putting more pressure on one side tends to make it turn the opposite direction. Conversely, if you like it going mostly in circles tilt it slightly (it doesn't take much) and it will say in a fairly stable pattern of going in circles.

My kids think it's very amusing and my cats are a little unnerved by it. I can certainly think of worse ways to spend an hour and a dollar.