Just thought of some:
If you have a friend whos confused, you sing "If you Were Gay." And then they get all defensive. (Avenue Q)
When someone says "The Powers Out", you burst into RENT!
(well that ones kinda obvious)
If you quit a team or academy of sometime, you just say you don't wanna show off no more. (The Drowsy Chaperone)
You want your first car to be either Chitty or Greased Lightnin.
The Best of Times is Now!