The Big Bang Theory2007

Leonard Hofstadter:
[addressing a class of graduate students] So, if any of you are considering in going into experimental physics, my door is always open. Once again, I'm sorry that the demonstration didn't quite work out. But, now we know what happens when you accidentally spill Peach Snapple into a helium-neon laser. The short answer is... don't. And now, to tell you about the theoretical physics department is Dr. Sheldon Cooper. [students applaud] Dr. Cooper...

Sheldon Cooper:
[In closet] Forget it.

Leonard Hofstadter:
Excuse me. [opening door to closet] Sheldon, we both agreed to do this.

Sheldon Cooper:
It's a waste of time. I might as well explain the laws of thermodynamics to a bunch of labradoodles.

Leonard Hofstadter:
If you don't do this, I won't take you to the comic book store.

Sheldon Cooper:
[Coming out] Hello. Nice work with the laser, by the way.