Last night’s episode of Fox’s Family Guy had some fun with the low-hanging fruit that The Cosby Show has become. With the Griffins and others gathered ’round the tube, they and we see a tooned-up Cos in familiar bad sweater doing his familiar bad dance — but with his female co-stars a little less lively. As if the “knowing what we now know” bit couldn’t be any purer comedy gold, add appearances from “guest stars” Bonnie Franklin and a half-dressed Bea Arthur — and even a snockered NBC peacock looking a little less than proud. Enjoy.