Charmed, Season 2

Piper:
Still Phoebe, you have to take care of yourself. You have to get some rest.

Phoebe:
After. Piper, I did not go back to college to fail at it, okay. So what do I have to do? Okay, I'm gonna go change and then I'm gonna go to the library. Now, if any demon or warlock attacks, please just fend them off till Saturday. (to Leo) I have a question for you. Is it possible for someone to find proof that demons really do exist?

Leo:
Mmm, I don't know, maybe. But even if anybody did, nobody would ever know about it anyway.

Phoebe:
What do you mean?

Leo:
Well, evil doesn't want anybody to know. It has a system for covering its tracks, protecting its identity. That's why demons disappear when you guys vanquish them.

Piper:
Why do you ask?

Phoebe:
Just curious. Okay, adios.