This is definately right,I don't think any one here has the intro right, this is one is

Drop D tuning (it might be lower but D will do for now)

Intro

e-12-12-12-12-12-12-12----12----12-12-12-12-12-12-12-------|
B----------------------16----16----16-16-16-16-16-16-------|
G----------------------------------------------------------|
D----------------------------------------------------------|
A----------------------------------------------------------|
D----------------------------------------------------------|

Then guitar 2 plays over top

e----------------------------------------------------------|
B----------------------------------------------------------|
G----------------------------------------------------------|
D-X-X-X-X-5-0-5-6-0-0--X-X-X-X-2-0-2-3-X-X-X-5-0-0-5-6-----|
A-X-X-X-X-5-0-5-6-0-0--X-X-X-X-2-0-2-3-X-X-X-5-0-0-5-6-----|
D-X-X-X-X-5-0-5-6-0-0--X-X-X-X-2-0-2-3-X-X-X-5-0-0-5-6-----|
 repeat second part for a bit
after he screams and it gets really heavy just play

e----------------------------------------------------------|
B----------------------------------------------------------|
G----------------------------------------------------------|
D-0-0-0-2-0-2-3-0-0-0-5-0-0-5-6----------------------------|
A-0-0-0-2-0-2-3-0-0-0-5-0-0-5-6----------------------------|
D-0-0-0-2-0-2-3-0-0-0-5-0-0-5-6-(repeat about 2 X)---------|

Verse

e----------------------------------------------------------|
B----------------------------------------------------------|
G----------------------------------------------------------|
D-0-0-0-0-2-0-2-3------------------------------------------|
A-0-0-0-0-2-0-2-3------------------------------------------|
D-0-0-0-0-2-0-2-3------------------------------------------|

"you can't see california without marlon brando's eyes"

e----------------------------------------------------------|
B----------------------------------------------------------|
G----------------------------------------------------------|
D-0-0-0-2-0-2-3-0-0-0-5-0-0-5-6----------------------------|
A-0-0-0-2-0-2-3-0-0-0-5-0-0-5-6----------------------------|
D-0-0-0-2-0-2-3-0-0-0-5-0-0-5-6-(repeat about 2 X)---------|

Then play the verse again
then the chorus

"it's all in your head, it's all in my head"

e----------------------------------------------------------|
B----------------------------------------------------------|
G----------------------------------------------------------|
D-10-10-10--101010101010-10-10-10--------------------------|
A--9--9--9---9-9-9-9-9-9--9--9--9--------------------------|
D-10-10-10--101010101010-10-10-10-(repeat like 2 or 3 times|

Crazy part

e----------------------------------------------------------|
B----------------------------------------------------------|
G----------------------------------------------------------|
D-0-0-0-7/-0-0-0-1-0-1-0-----------------------------------|
A-0-0-0-7/-0-0-0-1-0-1-0-----------------------------------|
D-0-0-0-7/-0-0-0-1-0-1-0-(repeat for a while)--------------|
(SLIDE DOWN)

slower part

let ring throughout

e----------------------------------------------------------|
B----------------------------------------------------------|
G----------------------------------------------------------|
D-0---4---1---2--------------------------------------------|
A-0---4---1---2--------------------------------------------|
D-0---4---1---2--------------------------------------------|
then play faster and in mutes and go back to crazy part until the end

There you go keep on playin and listening to slipknot!!