Sorry for the grainy photograph, but I actually saw this at a buddy’s house and snapped a pic to share. The extension cord went behind that wall to the boiler room where he has his network devices — router, Vonage VOIP box, etc. — installed and wired out to the rest of the house.
He said he used what he had on hand — an extension cord and hole saw. I’m hoping seeing it on Toolmonger will shame him to remedy this. Feel free to help shame him in comments by, say, explaining why this is prohibited by code.