If you can grab Sir Paul McCartney's autograph, it'll be good for your portfolio. Sir Paul's signature is worth more than any other living entertainer. A scribble by Paul could score $3,275, according to a U.K. company that specializes in this kind of thing.
In fact, grabbing any of these 10 could put some money in your pocket....
9. Ringo Starr
8. JK Rowling
7. Muhammad Ali
6. Queen Elizabeth II
5. Tiger Woods
4. Bob Dylan
3. Paul McCartney
2. Prince William
...and the #1 most valuable autograph in the world comes from... believe it or not...
Fidel Castro. Fidel gets boosted the #1 after the death of Nelson Mandela.