By skyforbes 
1.
We met (and instantly fell in love with) Blaine and the Dalton Academy Warblers.
2.
Kurt and Blaine got together, thus starting one of the most popular ships in the show’s history.
4.
There was the EYE-CONIC “Britney/Brittany” episode where everyone kept having Britney Spears–esque musical hallucinations at the dentist’s office.
6.
Santana came out as gay, and her relationship with Brittany finally started to be explored.
7.
There was the prom episode plot twist where Kurt was elected prom queen as a cruel prank, and then he used the moment to stand up to his bullies.
8.
Holly Holliday made her first appearance, and she was cooler than Mr. Schue ever dreamed of being.
10.
There was the special hour-and-a-half-long “Born This Way” episode.
11.
Quinn and Rachel sang their unexpected yet ~angelic~ mashup “I Feel Pretty/Unpretty” in the “Born This Way” episode.
12.
There was *that* episode where the glee guys formed a band called the Justin Bieber Experience and got Bieber bangs, and the glee girls were OBSESSED.
13.
There was an episode where the glee kids would just get drunk at school and during performances that ended quite…badly.
15.
The adorably dorky Sam Evans transferred to McKinley High.
16.
Sam and Quinn became one of THE cutest pairings of the show.
18.
Lauren Zizes joined the glee club and brought her wits and charms with her.
19.
Santana and Lauren fought each other, and it was one of the most hilarious scenes on television.
20.
The Unholy Trinity quit the Cheerios, and we finally got to see what they actually dressed like.
21.
And last, Season 2 is simply just the funniest season of the whole series.