House, Season 4

Flynn:
The fun is in not knowing. [Dr. House appears to cut the magician's IV line, the magician looks worried]

House:
The fun is in knowing. [He shows the magician his intact IV line, showing that he cut a piece of plastic tubing]

Flynn:
[exclaims] Oh, my head! Oh! I have a headache.

Dr. House:
How bad? Is it new?

Flynn:
Oh! It's not too bad. I'll take one of these. [pretends to have a pill bottle in his hand, and pours out two real pills in his hand.]

Dr. House:
Hm? Vicodin. [Dr. House pulls out his actual pill bottle, and shakes it, hearing nothing shaking in it]