Officially, I would tend to agree that using the caps lock key is rarely acceptable. But really, when my violent rage sets in and I shamelessly lay on the caps lock key - it makes my inner badass, driven by hungry anger, stand to full attention, smoking unfiltered French cigarettes and lighting molotov cocktails with its demon fire breath.
But sadly, does it really make all the people fear me? No. It makes me sound like a dingbat.