slide your left hand up the strings as you push the whammy bar down with the right hand, keeping the pitch the same the whole time. sounds awesome if its done right.

push down on the 24th fret on the high E and scrape your pick up and down fromm the bridge to the neck, it sounds like in the cartoons when someone drops something. weeeeeeeeeeeooooooooooooooohhhhhhhh!

Do a whammy dive on the low E with quick-repeating delay/repeaton and reverb. You get all kinds of extra lower overtones than you would without the reverb delay. I use an RV-3 pedal so I can use delay and reverb simultaneously but it might work with just one or the other.

A very easy trick but a fun one that I like to do is tapping while divebombing.
Make sure your tremelo bar is tight (like so it doesn't swing around) and place it over your strings. Do a tapping position with your hands and while tapping use your elbow or forearm to depress the bar up and down. A buddy of mine knows Trey from Morbid Angel and Trey taught him this technique then my buddy showed it to me.

It's very simple but it sounds pretty cool.

Also another one that I learned (mention by amerok) from a Steve Vai lesson is drivebombing while sliding up the neck. Like say place your finger on the B string on the second fret and slide up while pushing the tremelo bar down. This creates a very odd sound.

I also like doing sweep picking combined with tapping/sliding (a.k.a. Michael Angelo Batio's "Whipper Sweeper". Although I can only manage to do it once. It's insanely hard keeping it going over and over again...well for me anyway. But when I can manage to pull it off everyone looks so amazed.

Another Micheal Angelo Batio trick I like is the famous overhand/underhand technique. While tremelo picking each string, alternately fret notes underhand (conventionally) and overhand, meaning that you bring your fret hand up and over the top side of the neck in order to finger the notes. It's very simple but it looks cool as hell and people look astontished when you show them.

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I was just wondering...

Listen to Necrophagist - Diminished to Be, listen to the solo.

Right at the very end of it he does like a harmonic divebomb i think, but then its followed by this fucked up scream thing, which is probably done with the whammy too.

How the fuck do you do that???

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That 'scream' thing, you can do if you have a slight delay on it, and bend it hard sharply

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Cool thanks man

It kinda sounds like a Steve Vai - going fuckin hard on the tremelo thing. Coz it has that vibrato kinda sound to it

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Thats just a 'gargle'? He is fretting a high note, and he gargles the trem, which is when you strike the bar with the palm of your hand and it wobbles on it's springs before the string tension/trem springs pull pulls it level again (very quickly) This happens while the note still rings out, so it's a lightning fast tremolo vibrato effect. It's pretty limited though.

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Ohhh i get it, thanks dude. Ill give it a go some time, its almost midnight here and the old lady probably wont appreciate me practising Necrophagist techniques

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Doesn't Laiho use that alot? Is that also called a whammy flutter?

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Yeah, I think it might also be known as a flutter.

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in diminished to be, he just hits the 24th fret, and pluks the trem arm (tis trick only works nice on edgepro tremolo, etter than others atleast)

basicaly, grab the trem arm, pull it up a bit and let it go, think of shooting an arrow or sumtin, that makes the trembar bounce literaly.

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Awesome dude thanks, it sounds fuckin sweet

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It may not be a cool "Sounds" thing

But as far as cool "looks" go. I have been working on some Batio Under and overs and damn they look good. Bloody hard though

Ok this technique is pretty awesome. Done live even cooler.

Amp On.
Lead In guitar.

After some sloppy soloing start to thrash around, take the guitar off your shoulder and simply throw it at a large solid object.
The guitar will most probably break but if lucky (or if you have a crappy throw) you may try again. As the lead is in the guitar, carnage will be maximal. Walk away as if you're Kurt Kobain.

If done probably, You should look like a rich retard that doesn't know how to play the guitar!!! Awesome huh?!?!?!

Why are you so gay?

Jusr found a cool one, i was blowing some shit off my fretboard, and it makes a really eerie fuckin sound if you blow across the sstrings as hard as you can.
You need an effect which is really fucking sensitive, but yeah, you can blow over the strings while fretting a chord and it gives this fuckin windy ebow kinda sound

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Ok serious one. Cool eerie effect,

Simply hold the pick perpendicular to a string and do a small 'violin' type motion. It makes a scratchy sound, but can also convey a cool melody if you fet some notes. It sounds better on the high notes but meh. I only do it on the highest string as you dont get interference from other strings.
If the edge of your pick is imperfect it can have pretty cooleffects too.
Meh, just an idea

Natural Harmonic around the 4th fret of the G string and pull up on whmmy bar. Total cliche.

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A similar trick can be done to create an R2D2 sound (yes, from Star Wars). With distortion on, lightly mute the strings by resting your fret hand on top of them somewhere along the neck. Hold the pick sideways and tap the HIGH E string above the pickups. Not just once, but do it in a repeated, quick fashion. As you're tapping the muted string, go higher and lower (toward and away from the bridge), which will raise and lower the pitch. Thus creating (at least when I do so) an R2D2 effect. If you want to just tap the same spot on the string, you can also use a whammy pedal to raise and lower the pitch.