A dead rat under the floor.
A poisonous mosquito that lived in the war.
A slimy potion from a haunted scientist’s house.
A bird’s feather from a mouth of a mouse.
A scaly frog’s skin that shines in the dark.
An old smelly sock found alone in the park.
Half a dead snake’s head from the cold river.
A dirty doll’s hand from the sewer.
Stir the mixture with part of a feather.
It will make you quack quickly forever.