The gadfly for pianio?

Literally, a gadfly is a fly that bites livestock, esp. a horsefly, warble fly, or botfly.Figuratively it is an annoying person, esp. one who provokes others into action by criticism.

Eithel Lilian Voynich, a soft-spoken lady was the author of the fiery novel Gadfly which shook human minds wherever it was read and made many a people revolutionaries. Perhaps it is more sacred to...

I was convinced my brother had been reading my diary so I sent a gadfly to torment him.

Socrates kept asking questions. And asking, and asking, and asking. When those questions were answered, there were others. Eventually, these led to more questions that the Greeks didn't want to even...

If someone calls you a gadfly then they probably don't like you because it means "a pest." ~guayas gal