Imagine you found a great deal on a flux capacitor. Not only does it make time travel possible, but the new version is able to freeze time and only requires half a gigawatt to operate. Plus, it’s 33 percent cheaper than the one Doc Brown built into the DeLorean. Sounds like a no brainer, until you read a couple online reviews claiming it set their cars on fire. And so you remove it from your shopping cart. This isn’t unusual, and according to a new study, it happens far more often than not.