Alyson Hannigan gets restraining order against man who allegedly threatened to kill her

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"American Pie" star Alyson Hannigan has obtained a restraining order against a man she claims is mentally unstable and threatened to kill her, TMZ has learned.

The "How I Met Your Mother" actress filed a request for a restraining order in L.A. County Superior Court, claiming John Hobbs has been harassing her on the Internet -- posting threatening messages on Facebook, MySpace, and Alyson's website.

Hannigan says Hobbs is "mentally unstable and was recently discharged from a mental hospital."

In addition to herself, Alyson got protection for her husband and two kids.

A hearing has been set for March 6th ... when a judge will decide whether to make the restraining order permanent.

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Holy fuck, that is terrifying.