Reese Witherspoon says she knew one first date was over when the guy corrected her grammar.

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Witherspoon was in New York last weekend promoting the romantic comedy "How Do You Know" when she was asked if she'd ever had a disastrous first date, such as the one her character has in the film with the man played by actor Paul Rudd.

"I had someone correct my grammar on a blind date and I knew in the first 10 minutes that the date was over. Yeah, you just don't correct someone's grammar," Witherspoon, a divorced mother of two, told reporters in Manhattan Sunday.

So, what did she say wrong?

"I don't know. I'm from Tennessee. I probably say everything wrong. I probably said 'ain't' or something," she replied.

Co-starring Owen Wilson and Jack Nicholson, "How Do You Know" opens in U.S. theaters Dec. 17.