Cant examine movies this closely, especially sci fi, the fact theres no sound in space makes pretty much 99.9% of movies unrealistic.
I know but... they examine these thing's in cartoons... in Dragonball Z there's this human race called "Sayans", their homeplanet consists multiple times the gravity of planet earth and their genes prevents them from ageing fast, they can live thousands of years because of that and just getting stronger.
I know, it's so realistic

, but atleast they point it out, you shouldn't leave shit like this out of the script in my oppinion... the movie predator is allready silly, so they should add more weight to the script
And especially in this movie the human centipede, they claim it's 100% medically correct well WTF

urinating is prety medically accurate part of human action's so it should be mentionned.