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gotcha
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gotcha /n./ A misfeature of a system, especially a
programming language or environment, that tends to breed bugs or
mistakes because it both enticingly easy to invoke and completely
unexpected and/or unreasonable in its outcome. For example, a
classic gotcha in C is the fact that `if (a=b) {code;}'
is syntactically valid and sometimes even correct. It puts the
value of `b' into `a' and then executes `code' if
`a' is non-zero. What the programmer probably meant was
`if (a==b) {code;}', which executes `code' if `a'
and `b' are equal.
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