Do you usually throw a curve ball to someone?

The meaning is –To do something unexpected or surprising that makes a situation harder to handle or plan for.

Examples

1. The teacher threw us a curve ball by giving a pop quiz on a Monday.

2. Just when I thought everything was going well, life threw me a curve ball.

中文意思是 – 出乎意料地讓事情變得複雜或困難（給人來個突然的挑戰或驚喜） / 出乎意料地让事情变得复杂或困难（给人来个突然的挑战或惊喜）