This is what our digestive system does. We are terrifying!! (also we have acid blood and utilise some of the most reactive elements on the table in our metabolic processes, eg. oxygen)
Also of note..
Our terminator style, persistence hunting.
We bare our teeth as a sign of happiness / friendliness. For most animals that extreme aggression.
We walk upright all the time. For most mammals standing upright is to make themselves look big and scary.