Kramer shut up. You consistently ***** about Spider-man without any facts whatsoever to back you up. Go to bed and let the grown-ups talk.
Havoc, those are the only two examples I have, but that's not the only time Wolverine has mentioned it. He has acknowledged to Hulk that Hulk can kill him by breaking his neck or by crushing his skull. The adamantium doesn't help that because that's still bone underneath. The surviving space doesn't really equate with that because it's not shattering bones, it's exploding the air within his body.