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Like this? This Oxford City Football team, a boiler room operation, duped people by saying that they were bound by a voice recognition and proved it by using the phone to make some beeping sounds. https://www.sec.gov/litigation/litreleases/2017/lr23869.htm

"Lying For Money" by Dan Davis has several chapters about financial fraud. It's a great read.

Or this? John Rohner, claimed that he'd developed tested and patented a "plasma engine" fueled by inexpensive and abundant noble gasses. He also claiming that he graduated from Harvard at 14 and had 3 Phds from M.I.T. Somehow he managed to dupe 98+ investors