In the quest The Missing Brother, upon returning to Rulvam Helseri to tell him that you found his brother's corpse, clicking [Lie] has the sequence repeat itself until you pick another response option. It's possible that this is intentional, and he's meant to insist that you tell him where you found his brother. This is easily interpereted as a glitch though. If it is intentional, I'd suggest adding a context clue of sorts. (Rulvam interupts you mid-sentence. -- "I don't believe you. Where did you find him?")