Whether it’s slicing open your own eyball and flopping the ruined pulp into a cold sink, or pulling the flesh off your forearm  like a wet novelty glove to prove to your future inventor that you really are a machine, being a Terminator involves high levels of self-mutilation.
 
Lesson for McG: That the best way to reinforce the inhuman nature of the Terminators is to have them hammer on the audience’s gag reflex.