"You.?"

Origin
When Kowalski's invention turns King Julien invisible, Julien says "See through, eh, what?", and Kowalski responds with "You.?"

How to use

 * When You.?-ing someone
 * When talking about the actual quote
 * When meaning to say "you"

Trivia

 * It is actually said differently than the real quote when You.?-ing someone