Acting strangely

Cecil's Columns/Staff Reports
1

Re:

http://www.straightdope.com/classics/a5_151.html

I would also take issue with the quote:

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I doubt very seriously that an agitated, frightened mother literally used the words “acting strangely.”

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Grammatical or not, I have no trouble believing that an agitated, frightened person – or even a perfectly calm one – would say these words. Though an error, it is in my experience an extremely common one.