HAPPY ENDINGS - "The Butterfly Effect Effect" - Some people wait for the groundhog to signal the end of winter. Instead, the friends wait for Brad and Jane's annual "spring smackdown," their yearly blowout of a domestic squabble, to let them know when Max will come out of hibernation and when winter will end, on "Happy Endings," WEDNESDAY, FEBRUARY 22 (9:31-10:00 p.m., ET) on the ABC Television Network. (ABC/MITCH HADDAD) ELIZA COUPE