According to a Businessinsider.com article-

"The New York Post reports that the Union Street Guest House in Hudson, New York, fines couples $500 for every negative review posted online (on any website) by one of their guests.

But it doesn't end there. The hotel will also fine you $500 if you're staying there to attend a wedding at another venue in the area, but leave a negative review about your stay."

Click here to read more.

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UPDATE:

"The policy regarding wedding fines was put on our site as a tongue-in-cheek response to a wedding many years ago. It was meant to be taken down long ago and certainly was never enforced," the Union Street Guest House said in an email to CNBC.