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