Monty Python's "Romans go home"

[Brian is writing graffiti on the palace wall. The Centurion catches him in the act] 

Centurion: What's this, then? "Romanes eunt domus"? People called Romanes, they go, the house? 

Brian: It says, "Romans go home. " 

Centurion: No it doesn't ! What's the latin for "Roman"? Come on, come on ! 

Brian: Er, "Romanus" ! 

Centurion: Vocative plural of "Romanus" is? 

Brian: Er, er, "Romani" ! 

Centurion: [Writes "Romani" over Brian's graffiti] "Eunt"? What is "eunt"? Conjugate the verb, "to go" ! 

Brian: Er, "Ire". Er, "eo", "is", "it", "imus", "itis", "eunt". 

Centurion: So, "eunt" is...? 

Brian: Third person plural present indicative, "they go". 

Centurion: But, "Romans, go home" is an order. So you must use...? 

[He twists Brian's ear] 

Brian: Aaagh ! The imperative ! 

Centurion: Which is...? 

Brian: Aaaagh ! Er, er, "i" ! 

Centurion: How many Romans? 

Brian: Aaaaagh ! Plural, plural, er, "ite" ! 

Centurion: [Writes "ite"] "Domus"? Nominative? "Go home" is motion towards, isn't it? 

Brian: Dative ! 

[the Centurion holds a sword to his throat] 

Brian: Aaagh ! Not the dative, not the dative ! Er, er, accusative, "Domum" ! 

Centurion: But "Domus" takes the locative, which is...? 

Brian: Er, "Domum" ! 

Centurion: [Writes "Domum"] Understand? Now, write it out a hundred times. 

Brian: Yes sir. Thank you, sir. Hail Caesar, sir. 

Centurion: Hail Caesar ! And if it's not done by sunrise, I'll cut your balls off.