The writing wasn’t always up to the talents of physical comedian Melissa McCarthy, hosting last night’s SNL, but there were still enough laughs to keep the show’s motor, well, purring. A recurring Kate McKinnon bit, coming near the end, paired her with McCarthy as Barbara and Tabitha, spokesladies for the Whiskers R We Annual Valentines’s Day Cat Giveaway. The featured felines were given increasingly loopy back stories (“We call him O.J. because he’s orange like the juice,” McKinnon’s Barbara said, “and a murderer like the athlete”) as the two women grew increasingly frisky themselves. The expression that spreads like some kind of joy across McKinnon’s face as McCarthy gropes her is pretty priceless.