Rivendare's Deathcharger is the one mount, after my Cenarion War Hippogryph,that I really, truly wanted, and for that reason, I thought I'd never get it. Some people will point out that it looks highly similar to a Forsaken Warhorse, but that is precisely why I wanted it. I
love those mounts, and this one was my dream ground mount, because it meant my Night Elf hunter could have an undead horse. I was realistic however, and I decided to tell myself that I was working up to one hundred runs minimum. I was having a bit of luck in-game this week, and thought, what the hey, and ran the instance. My thoughts going in were "one run more towards getting it", I wasn't expecting anything. When I looted the Baron, I was wondering vaguely what he would drop this time. Honestly, I couldn't believe it. Even when I got outside and mounted it, I couldn't believe it. It just felt unreal.
Not sure how I ended up in Darnassus, or why.

I was just so excited. Here's one with my lucky charm Aslan, who ran that instance with me.
Personally, I found that telling yourself you are going to get him "this time" just makes each run more disappointing than it needs to be. I set myself a few different goals; how fast I could run it, running the instance with every pet in my stable. It meant that some of my lesser used pets got to stretch their legs, so I enjoyed them.
Ok...that ended up being longer than I thought, sorry. I'm just really excited! The best part is, my other characters will get it too. Don't care about rarity, never did, I just can't stop admiring it. I did the same with my Hippogryph, and it's not rare at all. These mounts just mean a lot to me. When it's a mount you really want, never give up!