Walt Murders Gus Fring
One of the most memorable death scenes, period, finds audiences mourning the loss of Gus Fring. As Walt's methodical and quietly ruthless boss, Gus managed to survive the Mexican cartel and more to become the king of the drug heap. When pitted against his ace (Jesse Pinkman) and pushed into a life-or-death situation, Walt decides to go for the crown.
The image of seeing Gus with his face half blown off, adjusting his tie like nothing at all happened is a huge turning point in the program and lasts as one of the more moving parts on Breaking Bad ever witnessed.
See for yourself below: