Chelsea Clinton was caught off guard on the campaign trail at Butler University.

She was talking to the students in Indiana when a young man asked her whether the Monica Lewinsky scandal had hurt her mother's credibility.

This is what happened next.

"Wow, you're the first person actually that's ever asked me that question in the, I don't know maybe, 70 college campuses I've now been to, and I do not think that is any of your business," Chelsea replied sharply.

Chelsea Clinton said she didn't want to end the session on that note, so she wound up taking one more question on global warming.