OK, as would I.
What I read was called Pascal's Wager, his argument was about religion, but his point was if there is a slight chance of something incredible happening, are you not better to believe it could and reap the rewards if it did, than ignore it entirely.
I'd imagine at some point there has been an American who has left a fortune to a long lost relative overseas, so it could happen, it could be true. With that in mind, is the ridicule in believing it worth the money you could potentially receive?
It's a tricky one, because automatic response is always to side on the fact of it being so unlikely it's ALMOST impossible, but imagine if there was $10.000.000 out there with your name potentially on it, and you completely turned it down because you didn't want to be ridiculed.