Examples:

• And that is a curve ball on the outside corner.
• Well, this is a curve ball.
• I told her I took a curve ball.
• I can't hit a curve ball.
• Maybe I'm out of line, but this is a curve ball for me.
• I'll give you a curve ball.
• I apologize for the curve ball.
• Judy, it's a curve ball, sure, but we can do this.
• What do you think your dad would think of my curve ball?
• Yeah, thing is, sometimes life throws you a curve ball.