Hollow sounding bass line from my own song "Plaster You" (Link at bottom of post).
Specifically this instrument / part: Hollow Bass
Something about its clunky rhythm and detuned nature sounds like an eargasm to me.
Checked out the other songs up above, all pretty decent - certainly better then having some awful song stuck in ones head.
Dream Theater - Panic Attack
Wicked song, and it reminds me alot of Muse (although I'm not a massive Muse fan )
This.
http://www.youtube.com/watch?v=UtFNYApYi7E
Especially the intro.. That God Damn awesome intro, i can't sleep cause i can't get it out of my head.