[upon seeing Good Burger becoming a huge success]

Unbelievable. Two days ago, we had Good Burger CRUSHED! Now look at them.

[eating a Good Burger]

I think it's the sauce, boss.

[walks over to Troy, and headbutts him]

DUH! I know that! [to Griffin] You think Kurt's stupid?
[Griffin shrugs before quickly shaking his head]