Or be the only wooden-legged roller-skater in Holland Park.
Or be the double of some celebrity.
Or become unexpectedly heir to a large fortune left by an uncle who emigrated to America at the age of six with half-a-crown, and lived to become the Hairpin King. It is usual in this case to be photographed just after you have realised that the fortune is in dollars, not pounds. Sometimes the lawyer who discovered you, and assisted you to establish your claim, is included in this photograph.
Or make a musical instrument out of something else.
Or you might be a foster-mother.