#2 He is afraid of spiders
Despite being a man who can handle himself in a fight against someone much bigger, it appears that John Cena's biggest fear is definitely an interesting one. Like much of the population of the world, Cena is an arachnophobe, which means that his biggest fear is of spiders.
This became quite apparent back at WrestleMania 30 when Cena took on Bray Wyatt and he attempted to perform his well-known spider walk and Cena was absolutely terrified.
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Many wrestlers have strange phobia's, with The Undertaker's being seen as the strangest one because of his phobia of cucumbers, something that he has never fully explained himself. The only reason The Undertaker's phobia came to light was because Paul Bearer shared it with the world, and not the Deadman himself.