I have 3 but none of them are metal...

"And everything under the sun is in tune,but the sun is eclipsed by the moon" Eclipse by Pink Floyd

"Remember I will always love you...as I cut your fucking throat away" Pushit by Tool

"Oh how I would like to hold her(dramatic pause)head under water,oh" Doin' Time by Sublime

I change my mind:
"Rip off your head and fuck your neck" from Afterlife by Jungle Rot is a candidate too.AND

"...drinking beer in my house,he didn't realize,if he was to leave,he'd have to die" Hitch Hiker by Macabre.Not so much for the line but how it is sung.