One of the biggest (and by far heaviest) cameras I own is the Canon EOS-1 with a modular motor drive. It's a 35mm film camera produced around 1991 and at the time it was top-of-the-line. Actually, it still is a pretty darn good camera but with the advent of digital photography it has lost most of it's appeal.
The EOS-1 has been with me since 1998 and I've taken some of my best photos with it, but the high cost of film and development forced me to put it to the side in favor of the digital EOS 10D in 2002.
What makes this particular camera so interesting is not what I did with it
but what happened to it before I got my hands on it. When I first heard it was
for sale and called the seller he told me it was being repaired at Canon
headquarters because of some "signifficant damage" and it would take a couple of
weeks before it was avaialble. I bided my time and a couple of weeks later I got
a call that I could come down to his office and take a look at it. When I got
there the photographer showed me a severely banged up body with a shiny new back
piece. He told me that this was one of two camera bodys he had brought with him
when he went on assignment in Bosnia during the Balkan war. At some point he had
been caught in the crossfire and in an effort to not get killed he dove into a
ditch and landed full force on top of the camera. The back piece broke and the
lens mount was indented as a result. When he came back he put the camera on a
shelf and forgot all about it having just moved to digital. Now that he was
selling it he had sent it to Canon to get the back piece replaced and the lens
mount realigned. So although the camera looked like it had been dragged behind a
moving vehicle, it was in full working order.
To be honest it was the rugged and damaged look of the camera that really appealed to me. That and the fact that it was a professional level camera for a bargain price. And as promised it worked perfectly. Still does to this day actually.