If I had my wand
I would Sectumsempra
If I had the chance
I’d kill you now
Why’d I let you live
Mercy clouds my vision
But I see you now
On Marauder’s Map
I solemnly swear that I’m up to no good (Luke)
Mischief managed
I see Wormtail now
I see his [bad word] 
The trap is set
To catch that rat
 [bad word] curse
I will make you suffer
Avada Kedavra’s
Too good for you
I solemnly swear that I’m up to no good (Luke)
Mischief managed
Avada Kedavra’s
Too good for you
 [bad word]  Sectumsempra, the killing curse
 [bad word]  Sectumsempra, the killing curse
Victim of my spells [bad word]  Sectumsempra, the killing curse)
I can see you [bad word]  [bad word]  Sectumsempra, ….)
Say goodbye 
Avada Kedavra!
I solemnly swear that I’m up to no good (Luke)
Mischief managed
On marauder’s map
Mischief managed
I solemnly swear that I’m up to no good