Findle's Loot-a-Rang D: because it makes the game better to wish you were an engineer or huntard (if pets still have fetch, haven't checked yet)
Then we have Salyin Battle Banner which was nerfed to Pandaria only. Everyone reroll nelf or rogue.
The horn only works to level 93 or something (that may have been done earlier, not sure).
I'm sort of afraid to look for others, because it will just upset me.
Others? What have you noticed? Which of them bother you the most?