Doug was frightened by a rat coming into his bedroom when he was a child, and he now has a rat phobia. However, despite having been severely shocked by putting her finger in an electric outlet, Martha has no fear of sockets. This inconsistency is explained by the theory of

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The theory of preparedness suggests that humans are biologically predisposed to develop phobias towards certain stimuli that were potentially dangerous throughout evolution. For example, rats and spiders were more likely to be a threat to our ancestors, so it's more likely that humans could develop phobias toward them. However, there is no evolutionary reason to fear electrical sockets, and thus Martha did not develop a phobia towards them.

Doug Was Frightened by a Rat Coming into His Bedroom