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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