I am the one who knocks is a popular quote from Breaking Bad, said by Walter White in a monologue where he expresses his dangerous nature.
The phrase is heard in the Season 4 Episode 6 of the series, which was first aired on August 21st, 2011, with the title Cornered.
In one of the scenes, Walter and Skyler White (played by Brian Cranston and Anna Gunn respectively) are having an argument about being in danger, to which Walter reacts with the phrase “I am the danger. I am the one who knocks”.
A separated clip of the scene was uploaded to YouTube by Dab Lysiak on August 23rd, 2011.
The monologue grew to be a popular reference in pop culture, with actors such as Samuel L. Jackson also performing it on occasions.
“I am the one who knocks” may also be heard in several songs as an insert or sample, spawning on platforms like SoundCloud.