At the start of the combat phase, all ships within range 1 of jar jar gain a stress token, including the ship he is on. The ship he is on is also dealt 1 damage card.
I swear, this is exactly what some clones did in a clone wars episode. Deliberately sent JJ into a group of bad guys because they new he would cause a massive distraction and accidentally destroy the tank he was put on.
It was a win-win: either he'd distract the enemy and wreck everything, or he'd be killed.