What did Romans use to cut pizza before the rolling cutter was invented?

Q: What did Romans use to cut pizza before the rolling cutter was invented?
A: Lil' Caesars

This is a pun. The joke is that "Lil' Caesars" sounds sort of like "little scissors".  It is not a very good pun, though, because you would have to have a pretty thick, fake, Mexican accent in order for the two phrases to really sound the same.