o.o; - Mildly distressed and confused. (sweat drooplets, of course..)
O.O; - Very distressed and confused, about to have strange sexual acts performed on you by a stranger.
>.o - Eye poked.
/O.0| - Peering at someone sideways.
-.-
o.o
0.0
O.O;
X.X
x.x
...
Exploding head sequence.
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