Here's somethin I just discovered while trouble shooting my computer
I have one of those SATA harddrive caddys tried swapping out some hardrives back and forth (computer was finished wrting).
When I picked the hardrive up and tried to place it on the desk I suddenly found it too heavy to manuever by my fingers. Turns out the workings inside were still spinning (7200 Rpm) and it acted like a gyro.
I suppose that you could try putting one under your hat and then attempt to look up or down