Playing Possum

Often accused of acting like it's dead, or "playing possum", an opossum is actually not faking it.

Picture from Flyover People Daily

When confronted with a threat the opossum will launch into an involuntary response causes the animal to fall over, bare it's teeth, and even secrete a foul smelling fluid from its glands to make it seem less appetizing. Opossums cannot voluntarily wake up from this state and usually do not regain consciousness for 1-4 hours.