Emphasize your surprise at unexpected news by using 'say what?' in a lively tone.

Surprise Element

When you can't believe what was said, use 'say what?' to make the speaker confirm it.

Asking for Clarification

Show that you doubt what has been said by using 'say what?' with a questioning tone.

Use 'say what?' when you haven't caught what someone just mentioned.

Politely ask for repetition in casual conversation if you didn't hear the first time.

Convey that you are mildly shocked or taken aback by someone's unexpected action.

Use 'say what?' to question a decision that seems surprising or ill-advised to you.