Gemma's confession of her rape to Jax and Clay. Also qualifies as Tearjerker
Tara's beatdown, physical and psychological of the administrator
Unser, upon being confronted with video tape of Hale being offered a bribe by Zobelle, yelling at Hale for letting him get caught in such a compromising position and pretty much acknowledges that he needs Hale and his by-the-book, squeaky clean way of doing things intact in order to keep the entire department from being 100% corrupt cops.
Gemma and Fiona versus Jimmy in the kitchen.
Ally Walker (the actress playing Agent Stahl) gets one in season 2. Jax taunts her by asking about fellow agent Kohn (whom he has murdered) "Ever hear from Kohn? (Beat) Dangerous being a fed." Her facial expression is completely unchanged, the only thing revealing her recognition and seething rage is the subtlest of facial tics.
Gemma literally not even flinching as she's dropped into an ice bath while faking a fever in season 3.
Lincoln Potter walks into a session of the city council and dumps a bag full of sex toys and porn on the table to illustrate where exactly Jacob Hale is getting the funding for his new housing development. He then points out that one of the sex dolls manufactured by Hale's Japanese backers is that of a child and sold to pedophiles.
The season two finale would definitely qualify. As all around megalomaniacal super villain Ethan Zobelle begins his escape guarded by several unfriendly looking Mayans, The Sons are seen off by their respective women. On the highway, they meet up for what looks to be a motorcycle mounted very blood battle. Suddenly, Zobelle notices a passing truck with Unser printed very clearly on the back hatch. Qualifying as one of the most epic Oh Shit moments in television, the back hatch flies open and a truck full of heavily armed Sons unleashes hell on Zobelle's escort well the rest of the Sons begin firing at them from behind. Shakespeare himself couldn't have planned a more perfect ambush.
Throughout the series Chucky had been the Butt Monkey and Plucky Comic Relief. When he hears about the Sons trying to gather the money to pay ransom however he tries to talk to several members; but they are wrapped up with the Russians, before he takes one of the boxes he was trying to show them and opens it in front of Jax before he can put it off: sheet after sheet of misprinted counterfeit money that Chucky was told to destroy when the Sons offered him up to another gang. The Sons use the fake money to save the day.
The season three finale, particularly when Chibs gets revenge on Jimmy and Opie gets revenge on Stahl.
Juice navigating a mine field, rather than go around it. Sure he had a death wish, but even Romeo looks at him all "what the fuck?"
Jax double-crossing Pope, saving Tig, and setting up Clay as the fall guy.
Tara getting her bitch on and beating the crap out of the inmate who stole her blanket and is about twice her size.