I Am The One Who Knocks

The companion line to "I am the danger," also from Season 4, Episode 6 ("Cornered") of Breaking Bad, created by Vince Gilligan. Walt tells Skyler that he is not a passive target but an active threat — the one who initiates violence, not the one who suffers it. Bryan Cranston's delivery of this speech is frequently cited as among the finest in prestige television drama.