For context, Tony confronting his mother upon having heard the FBI recordings in which Livia all but commands Junior to kill her only son makes for an awesome scene by itself, but Livia cackling at Tony's futile attempts to intimidate her elevates the scene even more.
Christopher avenging Brendan's death by chasing down and killing Mikey Palmice with Paulie is pretty damn satisfying too.
Furio's debut as Tony's newest enforcer in "Big Girls Don't Cry". In the process of collecting from husband and wife brothel owners who owe Tony money, Furio busts into the brothel, beating the shit out of anyone in his path on his way to savagely beating both with a baseball bat, topping it off with kneecapping the husband.
Chris, who is right-handed, repels his attackers and takes Sean Gismonte down with a clean headshot, with his left hand, from the ground, when already wounded.
Janice killing Richie after he struck her across the face.
The Season 2 finale, set to The Rolling Stones' "Thru and Thru," which encapsulates everything that happened during some 13-odd hours of television into a few minutes. The song is also definitely badass and effectively reminds the audience of events and characters with carefully selected imagery.
Carmela and Hugh's respective rants against Livia during her funeral after party are two of the most satisfying scenes to watch in the whole series.
Even if it's a mafia code violation, Tony beating the shit out of Ralphie for murdering Tracee was immensely satisfying.
Valery, the Russian from "Pine Barrens."
He gets his windpipe crushed by Paulie and is presumed dead so they tape him up in a carpet and throw him in the trunk of their car. Some time later they open the trunk and he had chewed through the tape. They march him through the snow into the woods and despite wearing only his pajamas he shows no sign of discomfort while Christ and Paulie are both freezing. When they tell him to dig his own grave he boasts "Cocksuckers. I'll kill you both. You think the cold bothers me?! I wash my balls with ice water. This is warm. You American pieces of shit!" before kicking both of their asses with a shovel and running off. The guys chase after him but can't catch him, even though the only shoes he's wearing are slippers. Paulie manages to shoot him in the head but he immediately gets back up and keeps running. Then he disappears and is never seen again. It's revealed that he was in Russian special forces and single-handedly killed sixteen Chechen rebels. There is an implication that he climbed a tree to hide from Paulie and Chris, then went back and stole their car but he is never heard from again.
The entire scene with the Principal at the Hudson Military Institute is a great one. Much like with the psychiatrist and Carmela, the Principal offers an expressly entertaining, calculated, and wise take-down of AJ and the educational background that he has. It also doesn't hurt that he's played by Tobin Bell.
Artie Bucco gets screwed in a vodka distribution scheme engineered by Jean-Philippe, the brother of his new French hostess. When the deal goes sour, Artie, having borrowed money from Tony to finance the deal, goes to confront Jean-Philippe, and is soundly thrashed. When a despondent Artie later attempts suicide via an overdose of sleeping pills, Tony learns of the deal's collapse, and opts to assume responsibility for collecting the debt. This entails Jean-Philippe answering his door and opening it to find FURIO GUNTA.
Tony managing to overpower and kill Ralphie in a fistfight. Even more so since Ralph had essentially pepper sprayed him, in addition being much more cunning and spry.
Carmela: Who knew all this time you wanted Tracy and Hepburn? Well Tony, what about all the thousand other fucking pigs you had your dick in over the years? The strippers, the cocktail waitresses, were you best friends with all of them too? You fucking hypocrite.
As dark is it may be, the dread, tension, and build up to the death of Adriana La Cerva is one of the most beautifully structured in the show. With all the terrible death moments in the series, the feeling this one gets tops them all.
Season 6A / 6B
Artie, the meek civilian, confronts mobster Benny Fazzio outside his home and ends up assaulting him (for revenge for a scam Fazzio pulled on Artie's restaurant) - against all odds, Artie actually wins this fight. This triumph is short lived though, since Fazzio later shoves his hand into boiling sauce.
Sal Vitro, the innocent gardener who accepts Paulie's protection and goes through a Trauma Conga Line throughout Season 5 and 6A, has been mowing John Sacrimoni's lawn for free for a year. In the episode "Moe 'n Joe," with Johnny Sack's imprisonment and allocution, and the sale of his home to Janice and Bobby, Sal humbly asks Tony to free him from this obligation. When Tony initially refuses, Sal shows tremendous balls by pressing for it. He gets his wish, giving the man at least some small respite.
The ending of "Stage 5", when Phil decides he's not taking shit from anybody anymore, followed by Catlin's baptism with a Revealing Hug between a Tony and Chris, which highlights the bubbling resentment between the two men. Very chilling and emphasized by the haunting song "Evidently Chickentown". Watch
The hit on Phil Leotardo. Not only is extremely karmic, given all the horrible things he did, the way hes taken out must be seen to be believed.
As divisive as the finale is/was, there is no denying that the usage of Journey's "Don't Stop Believing" is pretty amazing. Fans usually remember Tony/James Gandolfini with a smile whenever they hear the song.