There's a nasty little bacteria that lived on an old medical plaster band-aid that was in the purse of an old woman. It (the bacteria) harboured hopes of being used on a human wound and have the chance to enter the human body and course through the bloodstream and cause an infection to the heart that would spread to the brain like meningitis, to which it was distantly related.
“Someday, someday!” the bacterial would mumble to itself, and wish it had a fist to clench and shake menacingly. “any day now!”
But the day never really came. The old woman threw the plaster away one day because it was too old and looked dirty. She didn't even notice that the wrapper was torn. She was frugal but frivolous enough to throw this unused medical plaster band-aid away.