Agatha All Along

Who's been messing up everything?
It's been Agatha all along
Who's been pulling every evil string?
It's been Agatha all along
She's insidious (ha-ha!)
So perfidious
That you haven't even noticed
And the pity is (the pity is)
Pity, pity, pity, pity
It's too late to fix anything
Now that everything has gone wrong
Thanks to Agatha (ha!)
Naughty Agatha
It's been Agatha all along!
And I killed Sparky too