Somebody has really ticked you off. You're all steamed up inside and you want to vent that rage using words, but you don't want to confront them directly because you're either too polite or too cowardly. So do you:
A. Subtweet them.
B. With your finger, scrawl an insulting message into the dirt on their car.
C. Get a small sheet of lead, scratch into it a message cursing your enemies, roll it up and throw it into your nearest sacred spring?

Oh, I forgot to mention that it's 1700-2000 years ago and you're living in the Ancient Roman Empire, so the answer is C. A lead curse tablet.