Olympus 35mm f/2.8 Zuiko Shift Lens
A lens I found for $50 at an ailing camera store (remember those?). If you could find a shift lens back in the day, they were priced at hundreds of dollars due to their rarity. Originally this Olympus Zuiko was used to help compensate for perspective shifts in architectural photography, this lens has seldom been used. I suspect that was the case with all of these. It's just such a spectacular piece of optical-mechanical engineering.
Now that Spring is here, I'll load up with film and go see how the world in my viewfinder looks when its a little over to one side.