Characters with this feat can be so stupid it hurts. Anytime you speak or actively communicate with another intelligent being, you must roll a D20 for the duration of the communication not to exceed 5 minutes. If the communication exceeds 5 minutes, please roll again. If you roll a 1 or 2, all intelligent beings including allies within 60 feet that are able to hear and/or understand you must succeed Wisdom saving throw equally to DC10 + the Negative Modifier of your Intelligence score or take 1d4 psychic damage and have disadvantage on their next intelligence check. Creatures without intelligence or who also have this feat are immune to this effect.

In the long run, the greatest weapon of Mass Destruction is Stupidity. - Thomas Sowell