I'd do the Sir Mix-A-Lot rap,
Baby Got Back, aka: "I like big butts." I can rap it from memory.

I like big butts and I cannot lie,
u other brothers can't deny
that when a girl walks in with an itty bitty waist
and a round thing in ure face
u get sprung,
wanna pull out ure tough cuz u noticed that butt was stuffed.
deep in the jeans she's wearin'
i'm hook'd and i can't stop starin'
OH BA-BY i wanna get with d'ya,
and take ure picture
my homeboys tried to warn me
but that butt u got makes me so horny!
OOhh rump-o-smooth-skin
u say u wanna get in my Benz?
well use me, use me cuz u ain't that average groupie
I see her dancin'
to hell with romancin'
she's sweat,
wet,
got it goin' like a turbo Vette.
I'm tired of magazines,
saying flat butts are the thing
take the average black man and ask him that
she gotta pack much back
so fellas,
fellas,
does ure girlfriend got the butt?
tell her to shake it,
shake it!
Shake that healthy butt
Baby got back!
I like 'em round
and BIG
and when I'm throwin' a gig I just can't help myself I'm actin' like an animal
now here's my scandal.
I wanna get d'ya home,
and UGH,
double up UGH, UGH
I ain't talkin' 'bout Playboy, cuz silicone parts are made for toys.
I like 'em real thick and juicy
so find that juicy double,
Mix-A-Lot's in trouble,
beggin' for a piece of the bubble.
So I'm lookin' at rock videos.
Knock-kneed bimbos walkin' like HO's
...
Anyway, the whole rap's kinda ridiculous but it's the first rap I ever learned.