Use this when someone is taken aback by an unforeseen event or information.

Unexpected Surprise

This phrase adds intensity to the reaction, more than just being surprised.

Emphasized Reaction

Best used in informal situations like conversations with friends.

Use this when an underdog achieves an unexpected victory, causing a stir.

Often used in sports when a player or team is unexpectedly defeated or outperformed.

This is a figurative way to talk about defeating someone; no physical loop is involved.