Rule #12 - Never date a co-worker.
Jimmy began a relationship with NCIS Agent Michelle Lee. He really should have followed Rule #12, as Lee turned out to be a mole leaking highly sensitive information. Her punishment for breaking Rule #12 was getting shot dead by Gibbs. So don't break Rule #12—also, don't be a mole.
Watch NCIS Tuesdays at 8/7c.