Glee, Season 3

Will:
You're messing with adult things here, Santana. This is my job. This is my life.

Santana:
And this is my education, and it's not a joke to me, although it seems to be one to you.

Will:
What are you talking about? They all loved my performance.

Santana:
Because they don't know any better. It's your fault. You're their teacher. You went from "La Cucaracha" to a bullfighting mariachi. Why don't you just dress up as the Taco Bell chihuahua and bark the theme to Dora the Explorer? You don't even know enough to be embarassed about these stereotypes that you're perpetuating.

Will:
That's not fair!

Santana:
Isn't it? What did you want to be when you grew up? Why did you become a spanish teacher, Mr. Shue?

Will:
Because... it was the only teaching position open at the time.

Santana:
I want to remind you of something an amazing teacher once taught me: without passion, you can't succeed.

Will:
Who taught you that?

Santana:
You did. And you do. When you teach Glee.