"As Seen on TV" products for cars are as ubiquitous as they are bogus, so it's impressive that Jalopnik could narrow down a list of the 10 worst ones.  The most interesting entry here is the Tiddy Bear, mostly because anyone wearing it looks like they're being motorboated by Teddy Ruxpin. Soundracer and Whistle Tips are also worth mentioning because they're grownup versions of putting a baseball card in your bike spokes. The rest is such obvious hucksterism that I'm amazed there's even an audience for it. And now that I've said that, someone on late-night TV will discover that snake oil improves fuel efficiency.