Long ago, Brad Pitt used to date Gwyneth Paltrow. Gwyneth's mother, Blythe Danner, was performing in a play for the Williamstown Theater Festival in the Berkshires. Gywneth and Brad came to see the show. One of the theater ushers was an older woman, who did a lot of volunteer work with the American Red Cross, and this was mentioned to Brad in passing. Brad Pitt then autographed a Williamstown Theater Festival t-shirt and gave it to this woman, and she was able to use it as a prize to get more (desperately needed) blood donations. Everyone who gave blood that weekend got a raffle ticket, and someone won that t-shirt.
Again, it only took a minute of Brad Pitt's time, but he went above and beyond to give that volunteer something she could use to further her cause.