Margo finally lets the cat out of the bag: "My lovely boyfriend of lo these many months is f***ing my best friend" (1.4.14). What language—girl's got a way with words, that's for sure.
She plans on exacting her revenge tonight.
First target: the boyfriend, Jason "Jase" Worthington.
He leaves his car unlocked, so Margo Clubs it, rendering it inoperable.
Then they go to Becca Arrington's house, where she and Jase are going at it in the basement.
Quentin watches through binoculars as Margo calls Becca's dad and informs him that there's nookie going on downstairs.
Dad marches down there, and Jase flees out the window.
At Margo's request, Quentin takes Jase's picture.
It seems that Jason forgot to tuck himself inside his boxer shorts, and Margo and Quentin penis-size shame him to each other.
While Becca is upstairs, Margo hops into the basement and hides the catfish in the closet along with a note: "A message from Margo Roth Spiegelman: Your friendship with her—it sleeps with the fishes" (1.4.58). Okay, even Margo Roth Spiegelman uses her full name.
She spray-paints an M on the wall and they run into the night, Becca's dad pumping a shotgun behind them.
They pass Jase as they drive away, and Quentin tosses him his shirt.
Margo Roth Spiegelman is not happy that Quentin did anything nice for him, and they argue.
When they calm down, Quentin focuses on his breathing to slow down his heart rate. He's not sure if he's excited or scared to death.