Subject-Object Agreement

Which is right: "All the specators turned their heads" or "All the spectators turned their head"? The answer is there's no clear answer.

[audio:http://www.grammarunderground.com/wp-content/uploads/2011/02/0022-Subject-Object-and-Subject-Complement-Agreement-mp3.mp3|titles=0022 Subject Object and Subject Complement Agreement]

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