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

Hula Chair

Is it an amusement-park ride or a workout device? The Hula Chair attempts to create the ab-workout sensation of using a hula hoop (actual exercise) while sitting down (generally not considered exercise). Giving your abs a workout while filing papers is a nice idea, but trying to focus while your lower half is throttling around like this is absurd and, more to the point, oddly erotic. Oh, and the chair costs upwards of $250.

View the full list for "The 50 Worst Inventions"