I just found out the creator of Windows Task Manager accidentally left his phone number inside the app
Dave Plummer, the original creator of Windows Task Manager, accidentally embedded his home phone number within the application's code as an assertion to help debug a rare bug. The bug, which caused CPU utilization to exceed 100%, was eventually fixed by the kernel developers. Plummer never received a call about the assertion until he mentioned the story on YouTube years later.
PC Gamer
Original source
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