What is the deal with Marcel Luske's upside down sunglasses?!

[deekay140]

I wear glasses when not in the hand to gather info from other players without them knowing I am paying attention.
Poker is psychological warfare. I player can give away alot with his eyes, especially when you table talk. You can give away tells, subconsciously. I would guess that quite a few of those pros wore glasses earlier in there career.