... was when Kurt found out he was a finalist for NYADA and Burt said "Who's gonna tell Blaine? Let me do it!"
If your dad thinks about your boyfriend as quickly as you do when you get good news; if your dad is as excited as you are to share it - well, your boyfriend is part of the family. My headcanon about Blaine and the Hummels is canon.
The second most exciting moment of the episode for me was when I got to Skype to
anxioussquirrel that Sebastian is "sexist, racist, homophobic, and cisgendernormative." He's not just asinine; he's a total ass.