Cliff Stoll's Amazon listing for Klein bottles was hijacked by a foreign seller, Amvoom, which trademarked its name and used Amazon's Brand Registry to take over the listing. Amvoom redirected Stoll's positive reviews to its own product, a blackhead remover. Stoll was unable to edit his listing or sell his products on Amazon due to the hijacking. The issue was eventually resolved, but not before Stoll's inventory was depleted and his business was disrupted.