Back when Ulduar was the main raid I was flying there, and low and behold there is the time-lost proto-drake directly in front of me. I killed it and it was mine. Ran ZG repeatedly with my boyfriend looking for the mounts...raptor dropped and he outrolled me and I think I held it against him for a week. A few weeks later...tiger dropped, he won it but gave it to me.
I'm still riding around on my bloodbathed frostbrood vanquisher though, because it required skill to get it, and because on my server, it's actually a rare thing to see.