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?
I hope Future Esthar never invents anything for forensic science in any way.
Psychotic Cloning Machine.
A teleportation device in which your head could be switched with another organism's if they enter the other part of the device.
Basically I hope that all of those tired Hollywood clichés of apocalyptic futures (i.e. the aftermath of mass nuclear warfare, mass alien invasions, sterile though-controlling dictatorships, and/or media-numbed populations) never actually come to be.
Also, I sort of wish computers and the Internet hadn't been invented, yet at the very same time love them both dearly. It's hard to explain - part of me loves certain aspects of computers, for example this very community, but I don't like the probabilities of where it all will lead. Somehow I think that in the future, there will be little room for such websites, as the Internet is bogged down by marketing just like TV and movies are now, even though they weren't once. These may well be the glory days of the Internet that just won't last.