Use it to highlight obvious statements with a sarcastic tone.

Sarcasm Indicated

Can express annoyance, suggesting the other person stated the obvious.

Condescending Tone

Avoid in formal settings; it's a casual expression, potentially rude.

Highlights your genuine, strong surprise about new information.

Often used to react to unforeseen or startling updates.

Signals you find a statement questionable or hard to believe.

Suggests disbelief rather than appreciation or endorsement.

Often ironic, not to be taken as a literal inquiry or confirmation.