Etymology

“I return from robbing the rich to give to the—What’re you doing?” Robin Hood announced as he entered the humble cottage.

“Oh, hey, Robin,” Peasant Pickens did not get up off the sack of potatoes that had been fashioned into a sitting device to greet him. “Good job.”

Robin stared incredulously, “Have you even gone outside today?”

“Outside?” Pickens shifted to a more comfortable potato, “What’s the point if you’re helping us out?”

“I did not take up the vigilante life so you could become the very potatoes you sit upon!”

And thus “couch potato” entered into the common vernacular.