They make good boat anchors!
Also, they are a constant form of amusement after a good long hard ride with your buds, you can all enter into the "Huffy Toss" contest. He who wins gets a beer!
The are also an important part of a Bike Shops business, the repair portion of course!
L8R
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"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
"Your Bike Sucks" - Sky Yaeger