Short Attention Span

You have a hard time remembering details about what you tell others. Whenever you make a deception or intimidation check, contest that check with insight. If your insight roll was less than your deception/intimidation, you believe the falsehood and get +4 to that deception/intimidation roll. You may choose to skip the contested insight role once per long/short rest. This may also affect intelligence, memory, or history rolls at the DM's discretion, with varied effects. This may also manifest itself without a skill check as a roleplaying element during conversation or other activities.

Note: this feat is primarily intended as a penalty for characters with low Int scores as opposed to losing the ability to speak (i.e. lower than 6 Int)