Hey, my 400mm f/5.6L is NOT a perversion. We need to hear from the catadioptric mirror lens users who like DONUT shaped bokeh.
My current perversion, film-wise, is learning to shoot 4 x 5 black and white film. The view camera is a miniature monorail ToHo with all the movements (not ToYo) and the lens is a diminutive Fujinon 150mm f/6.3 - 3# for the camera, 0.2# for the lens and lesnboard, 0.2# for the film holder, and naturally, 3# for the tripod and head. The kit, not counting tripod and head, weighs a few ounces less than my 60D and 400mm f/5.6L birding kit. My OTHER film perversion is finding somewhere isolated so I don't have people asking questions about the view camera.
When I compare myself to the old-timers at the largeformatphotography.info forum, expecially the build-your-own-camera, 8" x 10" and larger format users, and alt-process (wet-plate, etc) practitioners, I seem to be rather vanilla.