Introduce an unexpected or challenging factor into a situation.
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To present an unexpected problem, question, or situation that is difficult to deal with or anticipate.
When someone throws you a curveball, they introduce something that catches you off guard and requires a quick, unexpected adjustment.
It is used when a sudden twist makes a situation harder to handle.
"Caught off Guard"
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Being surprised by something when unprepared, without time to plan a response
"Pull the Rug out from Under"
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Suddenly removing support or changing plans in a way that destabilizes someone
"Throw a Curveball"
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Introducing an unexpected challenge or surprise that is hard to anticipate or handle