- Klaus was one of the founders and leaders of the Nutella gang. Known at the time as "Handsom Klaus,' he reportedly had a reputation for ruthlessly exploiting the prostitutes who worked for him.
- After leaving the sex industry for good, Barkowksy struggled with a drinking problem.
- An Austrian pimp shot Barkowksy in "Charly's Nightbar" at Hamburger Berg 29 after accusing him of cheating.
- In later life he was an accomplished painter who predominantly worked with brushes, scrapers, combs, spatula, and hands.
- In 1989, Barkowksy went to jail after organizing a knife-throwing event in a neighborhood bistro, where a 21-year-old girl was allegedly struck with a blade.
- He had a job in a bar on the Reeperbahn, the central street in the St. Pauli district of Hamburg, and saw the thriving sex industry around him closely before becoming involved.
- His works made with acrylic on canvas, such as Domenica in the Sky or Electric Chair, are traded for several thousand euros and can be characterised as expressionistic, abstract and ambiguous.
- He got the name Lamborghini-Klaus after he was overtaken by a Porsche 911 in his first car, a Corvette, at the beginning of the 1970s. He then wanted to buy a car from Auto Becker with which he could never be overtaken again. He found a Lamborghini Countach at Hubert Hahne (former racing driver).
- In March 2021, at the height of the COVID pandemic, Barkowsky was thrown out of a bar for reportedly violating the mask mandate. Barkowksy subsequently went to Hans-Albers-Platz and allegedly performed a Hitler salute, for which he was initially fined 2,000 euros. However, his case was sent to a district court because he didn't pay the fine.
- At the height of Barkowsky's career in the sex industry, he operated out of his headquarters on a floor at the Eros Center on the Reeperbahn. At that time, he was reportedly earning 10,000 marks a day.
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