It knocked my socks off.

Meaning

It was extremely surprising and impressive.

Examples

• John: 'I just finished writing my novel!'<br>
• Alice: '<b>It knocked my socks off</b>! I always knew you had it in you.'
• John: '<b>It knocked my socks off</b>! That's incredibly romantic!'
• Alice: 'He proposed to me on top of that mountain!'<br>