What song is this?!

[operator]

I was messing around on the guitar when my fingers all the sudden played a riff. A riff I'm sure I've heard before. But I can't remember in which song I've heard it. Please help me out, I'm GOING CRAZY!!

 

[Textor]

i think i heard it too , but dont know where... sorry

 

[killax]

I remember hearing that in some good song before... I want to know it to! lol