A 29 year old man presents following an episode of altered behaviour for 15 minutes, where he was uncharacteristically violent. He did not lose consciousness at any point.

He cannot recollect the episode, but remembers experiencing a feeling of intense and indefinable pleasure immediately beforehand.

The episode was observed by his wife, who additionally noticed abnormal movements of his right hand.

This is his first such episode, and his medical history is completely unremarkable. He is not on any medications, denies substance abuse and only consumes alcohol socially.