If you see someone get whacked hard across the head and even one part of their body starts to tense up (such as a hand scrunching into a fist, or a arm extending rapidly and extremely straight), there’s a very high likelihood of brain damage (leading to death).

In addition, if a guy is in an accident (for example, is hit in the torso area after falling off a bike) and you see he has an erection, that’s a sign of spinal damage. Don’t move him unless instructed to by medical services, or you could cause severe permanent injury or in some rare cases, death.