Wrong Thing n.
A design, action, or decision that is clearly incorrect or
inappropriate. Often capitalized; always emphasized in speech as
if capitalized. The opposite of the Right Thing; more generally, anything
that is not the Right Thing. In cases where `the good is the
enemy of the best', the merely good -- although good -- is
nevertheless the Wrong Thing. "In C, the default is for
module-level declarations to be visible everywhere, rather than
just within the module. This is clearly the Wrong Thing."