The drive thru
The Bluetooth phone earpiece
Text messaging
Those hot dogs sold already in their buns
Come to think of it, all hot dogs
The Mustang
The voice activated phone answering system that many companies make you go through now just to talk to a person. If I ever meet the guy who invented that, he shall surely die a slow and painful death.
The Blu-Ray. Come on. We all know HD-DVD will win this format war. The fact that Blu-Ray exists is only hindering technology. I'd get into why, but that's a whole nother thread.
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And now something that doesn't exist that I hope is never invented
Fake human flesh. They were thinking about making a meat or meat substitute that tastes like human flesh. It was for people who wanted to know what it was like to eat people without actually eating people. I don't want this to be invented. The reason is, what if you like it? What if the company goes out of business? What if you really, really liked it?