If you were the kind of person who thinks Boathouse Thoughts, and you were the kind of person to relentlessly search pics and gifs and vids for clues to certain things, and you read...oh, let's call it gossip for lack of a better term...then some of these gifs coming out lately would really make your eyes go O.O.
It's the hand action. Gotta watch their hands.
'Course on Planet Earth, it's just a sign that they really are buds like the Firefly crew, or the Smallville guys.
Excuse me, whilst I dust off my space suit. :D :D :D