As far as weird stuff goes, I don't have a whole lot of stuff out of the ordinary. Most of the stuff that I consider "cherished" isn't something very obscure, like my Vectrex or my copy of The Krion Conquest I got for a dollar a garage sale. I've already made a Cassettevision thread, which IS obscure, but by no means a "holy grail." Yet, I do have a few things to show you guys.
First and foremost is a SEGA Space Attack arcade cabinet from '79. It has a slight sound issue I can't work out, but then again- it's probably the caps. The caps inside are still factory.
The only other two oddball objects in my game collection are:
A bizarre copy of Rush N' Attack for the NES, made by Dismac. Dismac is a Brazilian bootlegger company. I picked it up for cheap off Ebay, because I thought it was neat.
By far, the strangest piece on my collection is what you will find next to the Dismac cartridge. A prototype F-1 Race cart, or what appears to be. The story is even more intriguing upon how I got it. A while back, there existed a Mom and Pop game store in our shabby little town. It was a decent store for the time being, it's closed down by now, unfortunately. I went inside to see what inventory they had, and in the cramped supply of NES titles, I found this. It was only eight dollars, too. I'll never know what went inside the store owner's head as he priced this. Maybe he looked up Famicom prices? I really wish I knew. Later, I opened up the cart, despite my better judgement, and found a Famicom/NES converter inside. I have a Hogan's Alley cart with one of these.
There is something else I have that I find quite interesting, not a holy grail or anything, but definitely odd. It's a copy of Thunderball! for the Magnavox Odyssey 2. What's so weird about it is there is a label on the back stating it's not to be sold, but to photographed for a Century House catalog. I don't even remember how it wound up in my hands. I can't get a picture of it right now, as my Odyssey 2 games are stored away. I am remodeling my game room, at this time.