According to a report published almost a decade earlier, about a dozen inventors who created great products regretted them later. Even though they invented, they were said to be unhappy with the end result of their creations.

• The atomic bomb — J. Robert Oppenheimer/ Albert Einstein. “I have no remorse about the making of the bomb… As for how we used it, I understand why it happened and appreciate with what nobility those men with whom I’d worked made their decision. But I do not have the feeling that it was done right. The ultimatum to Japan [the Potsdam Proclamation demanding Japan’s surrender] was full of pious platitudes. …our government should have acted with more foresight and clarity in telling the world and Japan what the bomb meant,” he said.
• AK-47 — Mikhail Kalashnikov. “I keep coming back to the same questions. If my rifle claimed people’s lives, can it be that I…, an Orthodox believer, am to blame for their deaths, even if they are my enemies?” he wrote in a letter to the head of the Russian Orthodox church in 2010.
• The double slash — Tim Berners Lee.”Really, if you think about it, it doesn’t need the //. I could have designed it not to have the //,” he said, according to Business Insider.
• The pop-up advert — Ethan Zuckerman. Zuckerman wrote an essay for The Atlantic “At the end of the day, the business model that got us funded was advertising. The model that got us acquired was analyzing users’ personal homepages so we could better target ads to them. Along the way, we ended up creating one of the most hated tools in the advertiser’s toolkit: the pop-up ad. We came up with it when a major car company freaked out that they’d bought a banner ad on a page that celebrated anal sex. I wrote the code to launch the window and run an ad in it. I’m sorry. Our intentions were good.”
• Flappy Bird — Dong Nguyen. “Flappy Bird was a sensation a year ago. What looked like a crude and simple game proved to be hugely addictive thanks to it hitting that sweetspot between infuriatingly difficulty and being just playable enough to make you think that next time you’ll do better. “I cannot take this anymore,” he tweeted.
• The office cubicle — Bob Propst. “While working as a consultant for Herman Miller in the 1960s, Bob Propst introduced America to the open plan office and with it, the office cubicle. He told the New York Times in 1997, designed to “give knowledge workers a more flexible, fluid environment than the rat-maze boxes of offices. The cubiclizing of people in modern corporations is monolithic insanity“.
• Comic Sans  — Vincent Connare. “If you love it, you don’t know much about typography. If you hate it, you really don’t know much about typography, either, and you should get another hobby,” he said talking to the Wall Street Journal.
• Raleigh Chopper — Tom Karen. He told The Telegraph: “The Chopper wasn’t a very good bike. It was terribly heavy so you wouldn’t want to ride it very far. There was some guy who rode it from Land’s End to John O’Groats for a good cause and by the end he was cursing it.”
• Pepper spray — Kamran Loghman. “I have never seen such an inappropriate and improper use of chemical agents,” he told the Times.
• Coffee capsules — John Sylvan. He said a few years ago “I feel bad sometimes that I ever did it. It’s like a cigarette for coffee, a single serve delivery mechanism for an addictive substance.”