The target suffers from a dreadful speaking problem. This may force them to speak all their words in backwards order, a severe stutter, a requirement that they must always rhyme, or something else of that nature. Whatever the precise details of their speaking problem, it gives them a -4 penalty to Diplomacy and Intimidate checks, a -2 penalty to their leadership score, and a 25% chance of failure whenever they attempt to use a magical ability with a verbal component.