Caption: Surprise
explanation: For shocked and surprised emoticons use  mouth wide open (ｏ, 〇, ロ), surprised eyes (O O, ⊙ ⊙) and raised hands. You can also add character Σ (sharp jerk) or some cofusion (character ;). Furthermore, you can try to use big eyes in combination with small mouth (for contrast).
w(°ｏ°)w
ヽ(°〇°)ﾉ
Σ(O_O)
Σ(°ロ°)
(⊙_⊙)
(o_O)
(O_O;)
(O.O)
(°ロ°) !
(o_O) !
(□_□)
Σ(□_□)
∑(O_O;)
( : ౦ ‸ ౦ : )