Warhammer 40000 and Warhammer: Fantasy beat starcraft AND warcraft to each theme by about twenty years. Warhammer came in somewhere around 1970, starcraft was 1998. Warhammer was the original creator of the 'Green ork' (Not saying everything with snot green orks is a copy, just stating who first used the concept.) I know extensive lore about 40K and ready the lore about the starcraft factions made me gag.
Let me give you some examples: Zerg-Tyrannids. At the time Zerg were thought up the Tyrannids where becoming popular in warhammer 40000 stories and games, Tyrannids absorb the biomass of their dead and dead enemies and adapt traits of their for if they so wish. They also serve onbe single hive mind, have a chititnous shell, and attack in large numbers in brutal melee. Plus other lore. Also at the time blizzard released the Zerg Tyrannids could communicate with other aliens. Zerg are almost exactly Tyrannids at the time of their creation. Tyrannids where later changed to not being able to communicate.
Protoss-Eldar: Both: An ancient and debased people focusing on speed and stealth, seeking to fix the galaxy and balance it. Mortally wounded protoss are put in an armoured mech to keep fighting (Combination of Wraithlord//guard Dreadnaught: Space marine concept switched around) Low numbers mean they have to be extremely wise.
Terran-Space marine: Do I even have to say anything? Just look at two pictures of them side by side. Warhammer 40000 has traitor pirates and illegal traders that resemble spce pirates. Even a renegade space marine chapter. The influence of chaos and the powers of the warp are ever pressing on the weak mind. And the only way to drive it out is with blind devotion, devotion to the one person responsible for human survival and prosperity: the emperor. Embellished in propeganda a a god The emperor acts as a symbol that keeps mankind together.
Now I have to put something to back up my points, some other reasoning for my points other than inferrence. Did you know Games workshop (Creators of both Warhammer universes) were supposed to help make warcraft? My theory is that Games workshop wanted to use it as a way to introduce warhammer to a larger crowd (At that point it was only books and a tabletop game) but when Bluizzard told them they wouldn't include "Warhammer" in the name games workshop dropped out. Blizzard went on to finish the game (Stressed to create completely new ideas, they had to keep many of the themes from warhammer, but changes name and switch small things around in the races. And they went on to do the same with starcraft. Not all ideas are from Warhammer universes, but I do find that such a poorly covered collage of science fiction mostly from two universes a bit distasteful.
Anywhoo let's not turn this into a flame war, other wise it'll be Locked.
If all else fails; Duck. As a defensive stratagem it's very unreliable, but incredibly reassuring for a moment or two.