Language censoring
I've attempted to write language censoring software lots of times, and it's such an imprecise sciene you end up with all sorts of strange outcomes.
I think people in QA love typing in rude words since you invariably get lots of bugs back on it.
Bug - Must Fix
User able to enter "Satan's flaps" into dialogue
Bug - Must Fix
"Dick Van Dyke" is censored in dialogue
etc etc