The last (and probably final) motorcycle that I owned -- which was a while back now -- was a 1988 Yamaha FZR750. It was the first street legal Japanese machine available with an aluminum alloy frame and a rather rare motorcycle at that, like its cousin of the time, the FZR1000. The motor was rather highly tuned as well, meaning it was NOT a machine for a beginner or a rider with typical experience (I wasn't either).
I rode it for about 5 years and eventually sold it to some people that came up from Mexico to buy it. They were racers from Monterey, where a Gran Prix track is. I sold it for $500 MORE than what I originally paid for it (which is normally atypical for fast depreciating motorcycles). By 1993/4, the FZR750 was only available as a race machine -- available only out of a crate from the factory -- and at a cost of about US$12000 or a bit more. My "street" version was virtually identical to the racing version, except for the camshafts (rise and duration slightly hotter), the carburetor model and jetting, and the missing speedometer and taillight.
That machine served me well. Despite its rambunctiousness -- capable of wheelspin at a ANY speed, 13500 RPM redline, 5-valves-per-cyl, capable of 0 ~ 60mph in 2 seconds -- it was reliable and relatively civilised in traffic (water cooled). As for the most misbehaving 2-wheeled beast that I've ever owned, that prize would have to go to the Maico 450 that I owned in 1973. This was a big-bore Austrian-made 2-stroke motocrosser with a hair trigger throttle and far more torque than any human ever needed. There were various other machines that I had in my stable -- mostly dirtbikes and mostly in the 1970s: Husqvarna, Penton, Maico, Yamahas, and a Penton-maha.