It's not a bug, it's a feature!

I remember seeing an umpteenth Xerox generation of the Jargon Dictionary, which had an entry for "feecher" (as compared to "feature").

I seem to have thrown that out at some point, thinking the online version had it all covered. But now I can only find one link :(

Update: That link is no more, I found a PDF here, search for "feecher")

[feecher, feechur]
n. An unforeseen, arbitrary, or capricious attribute, which, once documented, is spelled feature (q.v.).