-You can never fight just a single murloc.
-They chase you forever.
-They repeatedly scream 'BRAWLARWLLARLAWRL!" when they chase you.
-Almost all of them either cast or throw spears.
-They are in almost every beginning area...somewhere. Except for dun morogh and durotar (I think).
-They almost always wind up killing you at some point.
-They run like drunken collegues chasing after a naked sorority girl.
-They can keep up with your swimming.
-Out of all humanoids, they very commonly seem to dismount you quickly.
-They always drop fish oil, shiny fish scales, or murloc eyes; all are useless bag-space wasters unless you're an alchemist or shaman.
They are also the focus of an extremely annoying in-game fad that involves multiple users discussing murlocs and substituting their names into stories/movies/games/comics/etc. for hours (and sometimes days) on end. Examples:
-Dawn of the Murloc.
-Star Wars: The Murloc Strikes Back
-Big Murloc's House
-The Lord of the Murloc
-Murloc Potter and the Sorcerer's Stone
-The Legend of Murloc: The Ocarina of Time
-Murloc MD (a reference to the Fox show,'House MD')
-Night Shift Murlocs
-When Harry met Murloc
-Super Murloc Bros.
Tom: "Hey Bob, there's a chest ahead."
Bob: "Alright, lets go loot it."
*Tom and Bob are killed by 10 suddenly-spawned murlocs*