Throw (one) a curveball American verb phrase mainly US
To surprise someone with an unexpected and difficult-to-handle problem, scenario, or inquiry.
It really threw Mike a curveball when Kim was fired.
John's death threw everyone a curveball. He paid a visit to an orphanage as recently as yesterday.
It threw her a curveball when her husband was arrested for possession of illegal drugs.
To be surprised by some sudden occurrence
To greatly surprise, shock, or confuse someone
The verb "throw" should be conjugated according to its tense.
Daughter: So I really want all my friends to have a great time. I was thinking it would be a good idea to have some candy out on the tables for people to snack on.
Mother: Well, if you want them to really enjoy themselves, candy is dandy but liquor is quicker.