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You can see the actor's mouth inside the Ninja Turtles Costume

Redditor AirPhforce posted this creepy screenshot from a high-definition version of the 1990 Teenage Mutant Ninja Turtles film showing a second set of human teeth visible inside Donatello’s mouth. Apparently this happens every time a ninja turtle faces the camera. Obviously it’s just the actor’s teeth, but holy crap that is scary! I’m glad I was never able to notice that as a kid or I would have had nightmares

That accidental pharyngeal jaw is reminiscent of H. R. Giger’s Alien design. Coincidentally, some xenomorphish creatures actually appeared in an episode of the TMNT cartoon in 1988.

Teenage Mutant Ninja Turtles vs Alien Xenomorphs

The episode, The Case of the Killer Pizzas, involved Shredder and Krang’s evil plan to get the ninja turtles to eat pizzas sprinkled with alien eggs. April O’Neil and Irma end up with the pizza though, and the eggs hatch in the microwave before anyone has a chance to eat it. I guess if they hadn’t microwaved it first we would have seen an alien burst out of April O’Neil’s chest? That would have been pretty messed up.