If you like your public radio serious and sober, this might not be the show for you. Not that The Colin McEnroe Show crew doesn't tackle weighty topics, but they also have a fondness for screwy explorations of culture, They might do a whole show on competitive eating or what it means to keep a stuffed animal into adulthood. They might fill the studio with accordion players. Luminaries as diverse as man-on-wire Philippe Petit, Sir Tom Stoppard, Erica Jong and ex-Monkee Peter Tork show up for full-show studio interviews. Whatever they do on Tuesday, count on Wednesday to be a complete departure from that.