I'm a coin with no value
A knife with no edge
A car with no fuel
The leftover on a plate

Useless and unused
Unwanted and unnoticed
Alone and forgotten
Lost and not searched for

I'm the irritant in the oyster
That doesn't become a pearl
A stone in a shoe
An itch you can't reach

A fly to be swatted
A bug to be zapped
A rodent to be trapped
A worm on a hook

I'm not on the list
I...