14 Weirdest Comic Book Weaknesses

Zatanna Zatarra is a magician who can perform spells by speaking backwards. With this skill, she can wipe her enemy's memory by shouting "TEGROF" or stop a crook dead in his tracks by saying "POTS!"

Another vocally-powered superheroine is Zatanna's teammate, Black Canary, who can shout so loudly, it can break the sound barrier. Her Canary Cry is so devastating, it can shatter objects or knock people off their feet. It can even impair Superman.

Zatanna and Black Canary are considered among the most powerful Justice Leaguers and they have taken down the biggest supervillains with a single word.

Unfortunately, their powers count for nothing if they can't speak. All you have to do to defeat them is shut them up. During Identity Crisis, Deathstroke effortlessly immobilised Zatanna by punching her in the liver, rendering her unable to talk.

Also, Black Canary is a professional singer, meaning she is prone to throat infections and laryngitis. If she develops any illness that affects her voice, she's screwed.