You haven't tried weird until you've tried a Kodak Retina (Reflex or RF), in all their madness.
- Film advance lever on the bottom.
- Film numbering counts down, not up, and must be reset to '36' or '24' manually, moving 3 at a time. Impossible with bulk-loads unless you know exactly how many you get to a roll, which makes the next point all the more fun...
- ... Metal gear film-advance teeth. Keep winding after the last shot, and it'll just happily shred your film sprocket holes without missing a beat, and there's no easily-discernible pressure difference to regular winding so you won't know when you're doing it. Once it's ripped you'll just keep on winding until you think, "hey, have I got 50 shots on this roll so far?".
- Aperture ring that moves the shutter speed in opposite directions. Perfect for deciding between DOF and shutter speed once you've set the exposure right. But when the light changes and you need to set the new exposure, there's a fiddly little wheel under the lens to move. That changes the aperture but not the speed. And if you're at one end or the other of the dial (and need to go further), you have to change the aperture/shutter speed together then keep winding with the wheel underneath. That's on the 'Retina Reflex IV', on the 'Retina Reflex' you literally pull the aperture ring towards you to disengage teeth and move it around.
- The light meter (on the 'Retina Reflex IV' and 'Retina Reflex' at least) is on the right, perfect for covering with your hand as you reach for the shutter. The shutter on the IV is next to the lens and not on top of the case like the 'Retina Reflex' and most other cameras.
- On the IV there is a little window out the bottom of the viewfinder to view the current shutter speed/aperture combo, a great idea in the days before in-finder LCDs / LEDs, so it's not all weird.
- The 'Retina Reflex' has lenses that are weirder still, the back three elements are fixed and you change the front cells, which ends up with an 80mm f/4 having the same front diameter as an 85mm f/1.5 lens I've got. These were interchangeable with Retina RF cameras, which only had RF calibration for the 50mm lens, so you had to line up the RF to find the distance then use a lookup table on the lens to figure out what you really needed to set it to, or something like that. When mounted on the Reflex the lookup-table is on the underside of the lens, which confuses you no end thinking the lens is on wrong unless you know what it does. There's also nothing stopping you from choosing a shutter/aperture combination of f/2 even if the lens only opens to f/4.
There's a great writeup on the Retina Reflex (and RFs) at Cameraquest, the strangest thing is that I read all of it, thought "wow, these cameras sound weird", and then bought a few anyway...