Rattled

Upset, Shocked, In disbelief, frustrated, RATTLLEDDD!

Usually occurs when something happens a person did not expect or can't believe happened.
When someone gets rattled be sure to call them out on it, usually receiving a response similar or equal to: I'm not rattled!

Yelling rattled in the person's face or shaking your hand back and forth adds to the effect.

Man, we were playing ... last night and Scott got so rattled after he lost!