A group of ravens is called an “unkindness”. And if that isn’t spooky enough, other collective nouns for ravens include a “treachery” and a “conspiracy.” 

The iconic poem "The Raven" launched Edgar Allan Poe from a virtual nobody to an overnight success, but his newfound popularity wasn’t always easy for the writer. Children were known to follow him through the streets, flapping their arms and croaking like the poem’s namesake. Poe’s response? Shouting “Nevermore!” at them until they ran away.