RNG is a bitch, no doubt about that.
I already have the Zulian Tiger and Baron after no lifing for a couple of months.
4th/5th Run through UP for Blue Proto Drake (2010) - I still remember waiting for my mate and a few other puggers to run back in after dying to skadi's fire and we were contemplating whether it would drop. It turned out it did and I won it rolling something ridiculous like 30 or 40. So glad that it wasn't my friend as I wouldn't hear the end of it.
2nd bag for White Polar Bear (2010) - Lucked out hardcore.
Rest will never go down in my history thats for sure. I can't commit to these things in MoP like I used to back WotLK.