Kara and still to this day its my favorite raid!!!
I remember doing the old 10 mans. Still consider 40m MC my first raid though.
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Firelands was the first raid that i actually did at the appropriate level (though i have been playing since vanilla). Fucking loved that place.
The first big one was MC. Someday back in 2006 I think it was.
It was probably BRD, if I recall correctly.
The first "real" raid was MC. I remember decursing people like a mad man on Lucifron, and he dropped the Arcanist Boots for me! First ever raid and I get an item, got hooked.
Strat, around lvl 55. First real raid - ZG in 1.8.
Real Raid? Molten Core
Fake Raid? Was either BRD or UBRS
Blackwing Descent PUG on my warlock, Won a 359 Caster sword from Trash and Ended up joining the guild i pugged with for the Rest of Cata and First tier of MOP.
I think it was Gruul's Lair (if you can call it a raid), then Kara back in BC. Though I do remember doing ZG as well. I can't really remember what I did first, actually. lol
Naxx in WotLK for a weekly raid quest during 3.3
Normal BWD with a group of guildies who already had experience with it during 4.1.
UBRS, I healed and didn't know I could see more then one group.
Hard to remember but I think it was UBRS or LBRS.
Zul Gurub was my first real raid.
Princesses can kill dragons to rescue knights.
Black Temple. I remember joining in late BC and doing it for the first time. Heck I even remember I struggled finding the way in to the instance due to the weird entrance as I thought it would be on that huge door (silly me but I was new).