The Warblers' bets and increasing frustration in "The Outlaws," and how Crazy-Prepared they are in general.
Especially this bit:
Nick: No. No, Blaine. That story better have ninjas crashing the party, we're-about-to-die sex and we-beat-some-fucking-ninjas sex with Kurt, dressing up again afterward to keep your parents from discovering the wounds, and a declaration in front of the fucking school that you and Kurt finally did it. And that you two are now gay ninjas, so bitches better not mess with you again.
Lemony Narrator: The story has a distinct lack of ninjas, peril, and sex. Neither does Blaine confess his love for Kurt (or their new status as gay ninjas) in front of the entire school. In fact, the story involves a drunk Blaine making out with Rachel Berry, mistaking drunk-and-horny feelings for feelings-feelings (which means Blaine's obviously never had alcohol before, not that anyone's surprised), and Kurt getting mad because not only was Blaine being an idiot, Rachel once said that she'd always have a better chance at winning guys than Kurt because most guys are straight and she's a girl.
In "The Hunters," they pick Blaine up and drag him to a counselor. And it turns out the Warblers do this at least once a year. Doubles as heartwarming, since they clearly care a lot about each other.
In the middle of the Wham Episode that is "Nikos," David tries to call an ambulance, but Alex grabs his phone and throws it away. Wes' response when it hits a car and the alarm goes off?