Blizzard likes to torment it's players by offering sets of gear, but making each piece (or token to be turned in for the piece) drop off a different boss. Then, they make the gear more powerful the more pieces you wear. At what we call the Tier 6 (T6) level, you get a set bonus with two pieces of the set, and another at 4. As yet, there is no Tier 7 - expect that with the expansion.
I had the gloves, hood and (ick, bleck, suck) legs drop into my lap unexpectedly all in one raiding week, but have had a horrible time trying to get the shoulders from Mother Shahraz. I either won't be in the raid the day she's killed or she doesn't drop the Priest/Paladin/Warlock token the day I am. One memorable time, several weeks ago, I thought for sure those shoulders were mine, because everyone else that wanted them already had them, but a warlock spoke up and he had more DKP than I. I really think I am cursed when it comes to those shoulders.
I totally had no hope of getting the robe token from Illidan - I thought for sure everyone would want that and we haven't killed him all that often.
Imagine my utter shock when I put in 'want' last night and...no one else did!
So, I get my 4 piece WITHOUT the shoulders. The shoulders WILL be mine... eventually. And then I can quit using those crappy legs, but it is hysterically funny to me that I got the robe before the shoulders.
Total non-sequitur: 'But why does it hurt to walk up the stairs?"