Mercyful Fate

You're in for surprise
You're in for a shock
In London town streets
When there's darkness and fog
When you least expect
me
And you turn your back
I'll attack
I smile when I'm
sneaking
Through shadows by the wall
I laugh when I'm creeping
But you won't hear me at all
All hear my warning
Never turn your back
On the ripper
You'll soon shake with fear
Never knowing if I'm near