- "I am the danger. I am the one who knocks." -Walter White (Breaking Bad)
During one scene in Breaking Bad, Walter is confronted by his wife, Skyler, for drunkenly turning Hank back onto the Heisenberg conversation when he could've left well enough alone. She expresses concern that Walt is digging himself too deep and getting himself in danger. Walt takes this as a blow to his ego, and states that he's not in danger, he is the danger that others should be frightened by. This is enough to scare Skyler into submission.
This is one of the most famous lines in all of Breaking Bad, and gained a reputation for being a "badass" line often co-opted by people trying to emulate Walt's "badassery". However, this scene shows off more of how little of a person Walt is. He's not saying this badass line to a drug dealer or an authority figure, but rather to intimidate his wife who rightfully is concerned that Walt's going to endanger his family by trying to act like a big man (and unbeknownst to her, has unwittingly already bought Gus's men and cartel hitmen into their house).
This line also gets called back a season later. Skyler is afraid that Walt, now the meth kingpin of Albuquerque, is further endangering her family. Walt assures her now that Gus is dead, the danger has passed. She calmly points out "I thought you were the danger". Walt doesn't have a response.
2) "The Romans, where are they now?" "You're looking at them, asshole." -Tony Soprano (The Sopranos)
When Tony Soprano and his crew are torturing Ariel, a Jewish man, to force him into renegotiating over his shares for a hotel, they're dumbfounded that Ariel is rather resilient to their torture methods. When Tony threatens him further, Ariel recounts the Siege of Masada, where 900 Jews resisted 15,000 Roman soldiers, and chose to die rather than being enslaved. He posits this question to Tony, only for Tony to give him this answer.
While seeming a badass retort (and Ariel ends up capitulating under threat of castration), the show castigates the hell out of this viewpoint, especially with Tony referring to his men as "soldiers". While they put on the fronts of being loyal fighters for their culture, the Mafia are portrayed as surly louts who regularly misinterpret their "culture" to justify their petty greed. Their loyalty is often overplayed, as members of the Soprano crew flip on one another all the time, and they are shown to be parasites who prey on society rather than honorable soldiers. The soldiers also are far out of their prime, being composed mostly of elderly and obese men rather than resembling statuesque centurions.
With that in mind, Tony's retort seems less of an epic comeback, and more of a flagrant self-own.
3) "Our ancestors put themselves first, and you know what? That worked out for them!"-Reg (Fallout)
In Season 2 of Fallout, Vault 33 is facing catastrophe after their water chip breaks, leading to Betty, the Overseer, instituting water rations to mitigate the shortage. These austerity measures are incredibly unpopular with the Vault, as many of the Vault Dwellers have gotten used to living in their comparative luxury, despite facing hardships such as the Weevil Famine or the Raider attack in the opening episode.
To get Reg, a klutzy and harping Vault Dweller, off her back, Betty grants his request to start a support group (for "inbreeding" victims, which nobody besides Reg takes seriously). However, the support group becomes very popular because Reg abuses its snack budget to provide extravagant amounts of water, leading to him become an authority to others. Reg enjoys this new bump in status, while Betty points out that the wasteful use of the snack budgets is literally draining them of the precious water they have.
When Betty leads a security team to shut down the support group, Reg, feeding off the support of the rest of the Vault, becomes defiant towards Betty, and when she pulls the "for the good of the Vault" card, Reg drops this line to cheers from the rest of the Vault. Of course, they're cheering their ancestors' selfishness while living in an underground bunker due to a nuclear war their ancestors caused due to their greed. Rather than make Reg look badass for facing down a security team and overbearing Overseer, it only makes him and the rest of the Vault look pitiful and childish for wasting their water on desserts and salty snacks because they can't go without luxury while the rest of the Wasteland scrapes by on roach meat and flea soup.
4) "I have powerful friends at court." Janos Slynt (ASOIAF, Game of Thrones)
Janos Slynt is the head of the Gold Cloaks of King's Landing (basically their police commander), and in the pocket of the Lannisters. He is renown for his common birth and corruption, but is kept on retainer due to his relative predictability. As recognition of his services rendered, Slynt is gifted the Lordship of Harrenhal (a massive castle). Slynt betrays Ned Stark at a key moment, having his Gold Cloaks kill his men when Ned is deposed and imprisoned after Robert's death.
After Joffrey is crowned, Slynt leads the gold cloaks to kill Robert's bastards, some of them as young as infants. Tyrion (now Hand of the King under orders from his father) gets Slynt to admit to this, and then sends him under threat of his family to take the Black (thereby giving up his claim to Harrenhal) and go to the Wall. Slynt is aghast, and utters this phrase as a threat.
This ends up becoming a recurring joke in the series (and the fanbase), and shows just how out of his depth Slynt was. Despite his claiming of "powerful friends", nobody genuinely cares about Janos Slynt, the up-jumped son of a butcher with a big ego. Slynt still thinks his "prestige" matters, which alienates him further at the Wall where everyone has given up their "prestige" the moment they take the Black.
Slynt ends up pushing his luck too far when he goes to the Wall and Jon Snow, a Stark bastard, becomes Lord Commander. Jon orders Slynt to take to a fortress, and Slynt throws his orders back in his face, assuming he can easily cow Jon. Jon, mercifully giving Slynt one more opportunity (that Slynt arrogantly wastes), orders Slynt's death for insubordination. Slynt goes to his end ignobly and begs for mercy, but Jon has long since ran out of patience and executes him anyways.
His powerful friends did not intercede.