While rehearsing for the play Waiting For Godot in Melbourne, Australia, Sir Ian McKellan was sitting in his tramp costume having a break when a passer-by gave him an Australian dollar.  The Gandalf actor explained:

During the dress rehearsal of Godot, I crouched by the stage door of the Comedy Theatre, getting some air, my bowler hat at my feet and seeing an unkempt old man down on his luck, a passer-by said, ‘Need some help, brother?’ and put a dollar in my hat.”

via Boing Boing.