Related:

• undocumented feature n. See feature.
• Windows 95 undocumented "feature
• That's not a bug! it's an undocumented feature!
• That's not a bug! It's a seldom-used, undocumented feature!
• We are Microsoft. What you are experiencing is not a problem; it is an undocumented feature.
• IBM Manual: The following is a heretofore undocumented feature.
  English Translation: It's a bug, it's our fault, and there isn't a damn thing you can do about it....
• One person's bug is another person's feature.
• Life is full of undocumented features!
• Aha! Pronoun trouble!" -- Daffy Duck