The song Certifiable is performed by Overkill .
I'm comin' home, I'm comin' home to you
'Cause you can't live without me
Who left the door, the window gate locked?
Who did the didn't want me in?
Way back when I was just a psychopath
Come on, come on, come on and let me in
Whoa! They tell me I'm insane
Whoa! Just something with my brain
I'm a good boy now, good boy now
It's certifiable
I'm a good boy now, good boy now
I know, I know, I know you're in there
I know that murder is a sin
I know I'm better than I ever was
Come on, come on, come on now let me in
Whoa! They tell me I'm insane
Whoa! Just something with my brain
Whoa! But you that I'm sane
Whoa! Yea you know that I've changed
I'm a good boy now, good boy now
Certifiable
I'm a good boy now, good boy now
What you done just ain't right
I thought of you every night
It was a painful as a human bite
We'll be together again
An' I know that you've been thinkin' of me
'Cause you want it the way it used to be
So leave the light on so I can see
And you better let me in
You better let me in motherf**ker
Come on, come on, come on and let me in
Who left the door, the window gate locked?
Who did the didn't want me in?
Way back when I was just a psychopath
Come on, come on, come on and let me in
Whoa! They tell me I'm insane
Whoa! Yea they say nothings changed
Whoa! But you know that I'm sane
Whoa! But you know that I've changed
I'm a good boy now, good boy now
It's certifiable
I'm a good boy now, good boy now
Good boy now, good boy now
Good boy now, good boy now
Good boy now, good boy