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• That's not a bug! it's an undocumented feature!
• feature n. 1. [common] A good property or behavior (as of a program).
  Whether it was intended or not is immaterial. 2....
• That's not a bug! It's a seldom-used, undocumented feature!
• A bug is a feature that didn't make it into the manual.
• bug n. An unwanted and unintended property of a program or piece of hardware, esp.
  one that causes it to malfunction. Antonym of feature....
• undocumented feature n. See feature.
• Windows 95 undocumented "feature
• Aha! Another "Undocumented Feature"!
• We are Microsoft. What you are experiencing is not a problem; it is an undocumented feature.