Answer:
Look into my face and I'm everybody. Scratch my back and I'm nobody.
At the sound of me, one may dream or stamp their feet, At the sound of me, one may laugh or sometimes weep.
With pointed fangs it sits in wait. With piercing force it doles out fate, over bloodless victims proclaiming its might. Eternally joining in a single bite.
It holds no blessings in disguise. Its rhymes are aimed at your demise, it's cast only to ruin, Whatever you are doin'.
Two bodies have I, though both joined in one. The more still I stand, the quicker I run.
What do angels sing in the shower?