They threw a curveball question so I messed up a bit at the end of the interview.
The test was known for certain curveball questions that left people surprised.
You caught me off-guard, I wasn’t ready to speak then.
She was taken off-guard by the surprise quiz given out by the teacher.
I’m pretty good at speaking impromptu, but if you give me time to prepare, I’ll be even better.
Being able to speak impromptu is a critical part of the job.