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I once successfully had a small claims court case thrown out in Orleans Parish because the small print on the back of cruise ship ticket said you had to sue in NYC. Poor woman just wanted her money back after a terrible cruise (new ship with poorly trained crew, spoiled food, etc, etc). Forum selection clauses are presumptively valid under maritime law.
I felt sick to my stomach.
Some days are better than others as a lawyer.
At least there, the claim arose directly from the transaction and exchange that contained the forum selection clause.