Ian was taking a quick break while rehearsing for the play he was in...
When this lady mistook him for a homeless man:
From the 2010 article on the Telegraph:
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.