For want of a nail the shoe was lost.
For want of a shoe the horse was lost.
For want of a horse the rider was lost.
For want of a rider the message was lost.
For want of a message the battle was lost.
For want of a battle the kingdom was lost.
And all for the want of a horseshoe nail.
NoMethodError: undefined method `nail' for nil:NilClass
from shoe:1, in `want nail`
from horse:1, in `want show`
from rider:1, in `want horse`
from message:1, in `want rider`
from battle:1, in `want message`
from kingdom:1, in `want battle`
from kingdom:1, in `<main>`
[ERROR]: the kingdom was lost