Awkward 6: Alex standing up to Jermaine and Kevin showing up out of nowhere so they and Lester can "take out the trash."
The MTV series:
S1 finale when Val, having had enough of Sadie's shit, dumps a bowl of punch all over her, then delivers an Ironic Echo of something Sadie said a minute earlier.
Ming gets two in S 3 E 9 — first, she punches Becca in the face after her crossing the line with getting Fred Wu in trouble at school, and then later having the rest of the "Asian Mafia" actually bow to her for what she did.
Matty telling off Eva in the mid-season premiere of Season 4.