please bring back danny trejo. Also dolph lundgren, jcvd, summer glau, any1 from potter, any of the ghostbusters, bill nighy, bob baker, kate mcgrath, phil glenister.
There are authentication companies that you can pay to get auto's authenticated - they look at the signatures and compare curviture on letters etc, but I wouldn't trust them. They often pass fakes, and besides I have 2 completely different Stallone autos, both signed in person, so who can really tell!
Unless that person passed away, or are really famous I don't think the cost of veryfying them is worth it.......