Weird software bugs
From Wikipedia, a list of unusual software bugs, including the Mandelbug and Heisenbug. My favorite is the Schrödinbug:
A schrödinbug is a bug that manifests only after someone reading source code or using the program in an unusual way notices that it never should have worked in the first place, at which point the program promptly stops working for everybody until fixed.
(via @greglopp)
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