unexpectedly · to one's surprise · go so far as to

He was surprised to find the great artist's masterpiece hung on the wall upside down.

I actually ended up walking all the way from Shinjuku Station to Jimbocho yesterday!

I still can't believe I did it.

Having forgotten his key, he was able to open the door by inserting a wire in the keyhole.

How come you have not started yet after a day.