
Knock/throw somebody for a loop
Unexpected Surprise
Use this when someone is taken aback by an unforeseen event or information.

When I won the lottery, it really knocked my family for a loop.
Emphasized Reaction
This phrase adds intensity to the reaction, more than just being surprised.

His sudden marriage proposal threw her for a loop.
Casual Expression
Best used in informal situations like conversations with friends.

Hearing her sing for the first time knocked us for a loop.
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