Cheese, Spam, sardines — nothing really good has ever come from a can. Hair is no exception. Hyped breathlessly on off-hour infomercials, spray-on hair is supposed to cover up bald spots. In practice, the can emits a fine powder that ends up looking a little better than if you had used a can of spray paint. If nothing else, it's evidence that there's definitely something to be said for growing old with dignity.
The 50 Worst Inventions
From the zany to the dangerous to the just plain dumb, here is TIME's list (in no particular order) of some of the world's bright ideas that just didn't work out