surprise by

surprise someone by something

to astonish someone by doing or being something. You surprised me by your forthrightness. No one was surprised by the way it happened.
See also: surprise
References in classic literature ?
I added immeasurably to my old friend's surprise by not even employing the post-office.
ATC/Vancom, which contracts with the city to operate the transit service, was caught by surprise by the walkout, spokesman Arthur Sohikian said.