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In Mortal Kombat X, when Erron Black uses his X-Ray on Predator, his bullet will say "Ugly Mofo".

This is a reference to the popular line by Major Dutch Schaefer (played by Arnold Schwarzenegger in the first Predator film) where he refers to the Predator as "one ugly motherfucker" when he has his mask off.
Contributed by AkiraTheWarrior