Not a trick question or anything! What do you remember growing up or now that you "thought" was a great IDEA and got sucked into buying it.
For me it was that dumb coil hair puller...OMG...hurts just thinking about it...if you don't know what it was it was the battery operated hand held thing with these coils that was "supposed" to pull hair out of your legs...or where ever you didn't want hair!! I can only imagine who tried the beaver area...I tell you what I tried it once on legs...it pulled some and made my legs red and hurt like it was on fire!!!! And the piece of crap was like $40 bucks out of my pocket...was so pissed I threw it away!