Hey there! Steve aka dsonesheets here, and after being out of the poster loop (i.e. hardcore) for a while, I started reading a bunch and came across APF. Immediately saw this Unicorn thread and thought I would help out and give some info on my own bonafide Unicorn, the Matrix International onesheet.
Scaled my own pic down from 11MB to an 800x600 pic, but can send the hi-res version if anyone needs it.
First thing I noticed after reading this and then pulling a pic of my own (original's in storage in another state) is that the Believe the Unbelievable does not infringe on the Matrix title; it's underneath and both are clearly separate from one another.
Second, and most importantly, in my copy there is a definite reddish haze around the lightning, and an ever so slight redness in Trinity's lips. I thought I read that some copies appear overly blue, and lack this distinctive feature although it appears on the German copies. My English version definitely has this.
Can't measure now, but when I see it again will do this. Here's the pic I found.
Apart from that, I think, apart from the other International onesheet for the Matrix, I have every poster ever printed (English), including what I might call another Unicorn, the Reloaded subway lenticular, which is freakin awesome. Only problem is, I need a light box for it, and that's gonna be a huge custom job, because it's huge.
Also, what does anyone think about the Batman Begins DS International onesheet? Is that rare enough to be considered a unicorn? Or do a lot of people have one? Obviously the best paper for the first movie, and I have the Joker DS Japanese B1 for #2 and the IMAX DS OS for #3, so I'm set on that trilogy.
BTW, I know most people will want to come over and shoot me for saying, but I got my Matrix Int'l onesheet off ebay about 8 years ago for $12 and shipping. Only one other guy put in one bid against me, I thought it was going to be a bloodbath. Once I got that one, I sold my only slightly lesser condition copy to Holiday. Mine has some slight right side edge wear, but apart from that is almost mint, and of course rolled. It's especially awesome because not only is it an awesome poster, but I am a Matrix freak, so it's double awesome. This one I will never sell, and I've never seen another since I got it.