Quinn and company make like Lady Gaga on the episode "Theatricality." It originally airs on May 25, 2010.
Added:
Perhaps you've heard of Jane Lynch and the job she does each week on Glee. The actress just cracks us up as Sue Sylvester.
Added:
Emma laid into Will on the Glee episode "Bad Reputation." She was harsh, but also very much on-point.
Added:
That's the back of Neil Patrick Harris. The actor guest stars on the 5/18/10 episode of Glee as a rival of Will's.
Added:
Oh, it is so on! Neil Patrick Harris' character confronts Will in this delicious scene from "Dream On."
Added:
Yes, that really is Neil Patrick Harris on Glee. The amazing guest-starring stint takes place on the show's May 18 episode.
Added:
Kurt and his dad have many issues to sort through. They have a chat in this Glee scene, courtesy of the episode "Laryngitis."
Added:
Jonathan Groff has been a welcome addition to Glee. He plays the funny character of Jesse St. James.
Added:
This doesn't happen often, but it happens on the episode "Bad Reputation:" everyone is laughing at Sue Sylvester.
Added:
Rachel finds her name at the bottom of an embarrassing list on the Glee episode "Bad Reputation." She's always atop our list, however. For anything.
Added:
Molly Shannon comes aboard Glee on the episode "Bad Reputation." She and Sue don't exactly get along well.
Added:
It took her awhile to break out, but now Brittany is one of the most popular characters on Glee. She's good for two hilarious quotes per episode.
Added:

Glee Quotes

[to Kurt] You know, these Mounds bars are delicious, but you have to eat them. If you just hold them in your hand hoping that you might get to eat them one day, they're going to melt and you'll look like somebody just pooped in your hand. Don't let waiting for things to maybe work out with Blaine turn you into the guy who looks like somebody just pooped in their hand.

Brittany

I just want somebody to love me.

Quinn