Heaviest thrash metal riffs?

[CFH]

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I found this to be rather interesting.

With that said, I'm curious to find out what people here think was left off, isn't that heavy, isn't even thrash, etc...

I also hope that the following list that I couldn't fill out on my own will be fully filled out soon.

Riff 1: Metallica, "Ride the Lightning"
Riff 2: Exodus?
Riff 3: Kreator?
Riff 4: Slayer, "?"
Riff 5: Anthrax?
Riff 6: Overkill, "?"
Riff 7: Megadeth, "Hangar 18"
Riff 8: ?
Riff 9: Anthrax, "I am the Law"
Riff 10: Testament, "Practice What You Preach"
Riff 11: Anthrax, "A.I.R."
Riff 12: ?
Riff 13: ?

[Bradzilla]

Riff 1: Metallica, "Ride the Lightning"
Riff 2: doesn't sound like Exodus
Riff 3: don't think it's Kreator
Riff 4: Slayer, "Haunting The Chapel"
Riff 5: not Anthrax, sounds like Overkill
Riff 6: Overkill, "New Machine"
Riff 7: Megadeth, "Hangar 18"
Riff 8: Kreator, "Coma of Souls"
Riff 9: Anthrax, "I am the Law"
Riff 10: Testament, "Practice What You Preach"
Riff 11: Anthrax, "A.I.R."
Riff 12: Kreator, "When the Sun Burns Red"
Riff 13: Kreator, "When the Sun Burns Red"

For pure heaviness, that "Hangar 18" isn't all that heavy. Lot of other good stuff there though.

[CFH]

Riff 1: Metallica, "Ride the Lightning"
Riff 2: doesn't sound like Exodus
Riff 3: don't think it's Kreator
Riff 4: Slayer, "Haunting The Chapel"
Riff 5: not Anthrax, sounds like Overkill
Riff 6: Overkill, "New Machine"
Riff 7: Megadeth, "Hangar 18"
Riff 8: Kreator, "Coma of Souls"
Riff 9: Anthrax, "I am the Law"
Riff 10: Testament, "Practice What You Preach"
Riff 11: Anthrax, "A.I.R."
Riff 12: Kreator, "When the Sun Burns Red"
Riff 13: Kreator, "When the Sun Burns Red"

For pure heaviness, that "Hangar 18" isn't all that heavy. Lot of other good stuff there though.

Thanks, and I thought the same thing about "Hangar 18." That song is definitely good, but it doesn't get remotely heavy until the solo section, which wasn't featured in this collection.

[Mythos Inibri]

unfortunately I can't see it there is just an empty box:(

[Xir0n]

Riff 2 is Overkill... uh... Skullcrusher. From Years of Decay, I believe.

Riff 5 is Horrorscope... Overkill.