NOTE: The object of surprise is usually evident in the sentence.
I'm surprised that nobody's thought of this before.
It doesn't really surprise me that nobody accepted the offer.
It will not surprise anyone to learn that the offer has been rejected.
Janet was surprised how quickly the time passed.
WordNet 3.0 Sense Numbers: 1
NOTE: Unlike sense 1, the circumstances of the 'surprise' are not improbable. For example, in the case of 'robbers were surprised by the police', police catching robbers is not an unexpected event.
The robbers had just opened the safe when they were surprised by the police.
I surprised a huge raccoon going through the garbage last night.
I surprised my roommate and her boyfriend on the couch last night.
He surprised me with flowers.
WordNet 3.0 Sense Numbers: 2, 3