For me it was
every single tanking drop from kara. I did over 20 runs in which I won a total of 1 (yes 1) roll and it was for the T4 gloves which I proceeded not to use. Never saw the pocket watch drop while I was tanking, or the BP.
Everything else I got beat on rolls. Including a holy pally grabbing the Battlescar Boots because, "prot is my main spec".
I did about half-a-dozen runs on my druid and quickly had more epics than my pally. It hurt.
That said. Keep going and diversify your options. If you are only running one instance per day for one specific item you could easily end up without it. If you add another option so you have two potential drops per day you greatly increase your odds.
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No really, I'm not
addicted.