Well, since everyone is offering their version of how the Vader/Emperor conversation should go, here's my preferred version:

VADER: Yo master, what'choo need me do?

EMPEROR: Yo man I am buggin'! Force be all disturbed and shit!

VADER: True dat.

EMPEROR: I don't know what up with this Skywalker muthafucka, but nigga be trippin'!

VADER: I heard dat.

EMPEROR: Nigga 'bout to be all up in our grill, fuckin' shit up old school!

VADER: Who, Skywalker? Shee-it, shorty ain't no playa! Even busted-ass Obi-Wan ain't got that nigga's back no more.

EMPEROR: Yo yo, don't even front. Nigga got mad Force. Boy gets hisself some Jedi skills and we ALL fucked. Now get on that shit, muthafucka!

VADER: Word is bond, master.

Seems like a reasonable compromise to me.

*Disclaimer: The above is a satirical work meant to reference speech patterns used not by African-Americans, but by members of the white American subculture commonly known as "wiggers." To any who may have been offended by my use of language... nigga please.