That would be The Party (hilarious film, but largely unknown, despite starring the funniest man of all time, Peter Sellers and the prettiest chart-topping murderess of all time, Claudine Longet).
"Why should Caesar get to stomp around like a giant, while the rest of us try not to get smushed under his big feet? What's so great about Caesar? Hm? Brutus is just as cute as Caesar. Brutus is just as smart as Caesar. People totally like Brutus just as much as they like Caesar. And when did it become okay for one person to be the boss of everybody, huh? Because that's not what Rome is about. We should totally just *stab* Caesar!"