Computer Dictionary/Bad Thing
That") Something that can't possibly result in improvement of the subject. This term is always capitalised, as in "Replacing all of the 9600-baud modems with bicycle couriers would be a Bad Thing".
Opposite: Good Thing.
British correspondents confirm that Bad Thing and [[Computer Dictionary/Good Thing|Good Thing]] (and probably therefore Right Thing and [[Computer Dictionary/Wrong Thing|Wrong Thing]]) come from the book referenced in the etymology, which discusses rulers who were Good Kings but Bad Things. This has apparently created a mainstream idiom on the British side of the pond.