Alien eyes

alien eyes, n.: the act of rolling a total of 3 on 3d6. [JV] Also, mutant snake eyes [LS]; spoof/corruption of snake eyes.
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Addendum: Depending on the game you're playing, alien eyes is the best sight for a gamer or the worst. It can also be declared a critical hit (or miss), depending on the system and GM, thus enhancing the gamers' feelings towards rolling it. 
Addendum #2:GURPS, for instance, uses a system where you roll 3d6 for most tests and try to get under a target number, so the result of alien eyes is cause for celebration.