Ryan Reynolds got down and dirty to fix a flat tire with a friend of his yesterday in LA. His much-anticipated X-Men Origins: Wolverine film hits theaters May 1, and Ryan's using the April 28 Hollywood premiere to help a good cause. He's auctioning off tickets to see the movie and be seated near him for both his Wolverine and The Proposal premieres. The money will be donated to the Michael J. Fox Foundation for Parkinson's Research, a cause especially close to Ryan's heart as his father also suffers from the disease.