These are basically a G-limit indicator. They come in 5 different G ratings (this one is 50G). There's a little tube of liquid in the middle that has dye released into it if the package to which it's attached gets dropped hard enough; turning the tube red. They are made by www.shockwatch.com, and can be purchased for about $2.00 each from a variety of web sites. I discovered these while watching Mythbusters. They use them as cheap excellerometers all the time.
I've used these for shipping electronic test equipment! Got the material handlers in some deep trouble for dropping a rack-mount computer once. Suppose you could put one of these in your helmet for bragging rights?
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