D is for 'Doubles'

Double exposures are great fun — and they give you twice the value of your film-frame too! Not something to be dismissed lightly in these troubled economic times ;-)
Then there's 'doubling' with a friend too, of course, when you get to reshoot a roll of film that's already been shot by a fellow Lomographer. I haven't actually done this myself yet, but, hey, I'm open to any offers, amigos...! ;-)