COMEDY Rules of Engagement CBS, 8:30 p.m. ET/PT Returning tonight following yet another interminable hiatus, this sitcom has its own loyal viewership. Now in its sixth season, the series rides off the comedic strength of ex-Seinfeld regular Patrick Warburton as Jeff, the world-weary everyman and husband of the much smarter Audrey (Megyn Price). Like Ralph Kramden or Fred Flinstone before him, Jeff is all bluster but no bite and is forever cooking up wacky schemes. Tonight, for example, he sends Audrey off on a “romantic scavenger hunt” in an ill-fated attempt to show that he's making an effort to spice up their relationship. At the same time, randy single guy Russell (David Spade) loses his cool when he learns the lovely neighbour Jen (Bianca Kajlich) might have a secret sex tape.