You won't believe...

Meaning

Used to introduce a surprising or unbelievable story.

Examples

• John: Guess what happened today?
• Alice: I have no idea! <b>You won't believe</b> this, but I won the lottery!
• John: No way! <b>You won't believe</b> what happened to me; I saw a celebrity!
• Alice: That's unbelievable! Which celebrity?