graffiti:

Here's how you know human nature has not changed much over 2000 years:

Roman graffiti found in Pompeii (which was destroyed when Mt. Vesuvius erupted in 79 A.D.)

1) "Jarinus, you live here!" (written in the bathhouse)
2) "Celadus the Thraex makes the girls sigh!" (written in the barracks of the gladiators)

from 500 Things To Know About The Ancient World