My wife and I are going to the midnight showing of "Harry Potter and the Deathly Hallows Part 2" and I am prepping a shirt by writting sayings on it.  Here's what I put on it:

-My other Pensieve is a Volkswagon.
-Double Agents get invited to all the Parties.
-Sectum Sempra

[Man are the fumes from the markers are dizzying.]

Outtakes:
-Double Agents go both ways.

(And if you can't tell, I like Snape.)