In convincing a person that ghosts are present
One must first assess the immediate environment
Doorknobs are handy
Especially if they turn from both sides
Books are useful
For they can be dropped and thrown
I once utilised both articles in a practical joke
Along with washing-up-liquid ectoplasm up and down the banister
My cousin had a heart attack
And died on the spot.
He still haunts me a lot.