That's a tough one, there's so many.
Some of my favorites:
"Im keepin it raw
Illegal Like Maleek and Jamal
Cause I don't believe in the law like Im Steven Seagal
Flippin off the police while I'm leapin the wall
Take a bunch of tylenol and fall asleep in the mall
I've got your little son you'll be receivin a call
your lucky this little punk's still breathin at all
fukk the world, this how I get even at yall
Pop X get rolled up and leave in a ball
I'll hit you in your mouth and sink your teeth your jaw
You wont be able to eat shyt, not even a malt
This lethal assault is giving you a reason to stall
Cockin this duece duece and squeezin it off
at the first burp or a fart, sniffle, a sneeze or a cough
Get your arm chewed off like you was teasing a dog
I'm cold enough and hot enough to freeze and unthaw
I kicked my girl out in ten degrees in her bra"
"I'm Ice grillin you
Starin you down with a gremlin grin
I'm Eminem, you're a faq in a womens gym
I'm slim, the shady is really a fake alias
To save me with in case I get chased by space aliens
A braniac, with a cranium packed full of more uranium
Than a maniac Saudi Arabian
A highly combustable head
Spazmatic, Strapped to a Kraftmatic adjustable bed
laid up in the hospital in critical condition
I flatlined, Jumped up and ran from the mortician
High speed IV full of Thai weed
Lookin Chinese, with my knees stuck together like siamese
Twins, joined at the groin like lesbians
Pins and needles, hypodermic needles and pins
I hope God forgives me for my sins
It probably all depends on if I keep on killin my girlfriends"
"I'll puke, eat it and freak you
battle? I'm too weeded to speak to
the only key that I see to defeat you would be for me to remove these 2 adidas and beat you
and forcefeed you them both, and on each feet is a cleat shoe.
I lift u off ya feet so fast wit a roundhouse
you'll think I pulled tha f**kin' ground out from underneath u,
I ain't no f**kin' G I'm a cannibal,
I ain't tryna shoot u I'm tryna chop u into pieces and eat u.
Wrap u in rope and plastic, stab u wit broken glass
and have u wit open gashes strapped 2 a soakin' matress,
Coke and acid, black magic, cloaks and daggers,
f**k tha planet until it spins on a broken axis.
I'm so bananas I'm showin' up 2 ya open casket,
2 fill it wit explosive gases and close it back,
wit a lit match in it, while I sit back and hope it catches,
Blow u 2 fragments, laugh, roll u and smoke tha ashes".