Within the limits of the tubular milieu, the only thing more entertaining than simply watching TV is making fun of it. This is the tried-and-true tack taken by the local comedy sketch group Nietzsche's Moustache in its new spoof 60 Minutes: the Musical!, which opens today at the Avenue Theater for a run that continues through the end of August. In it, the regular 60 Minutes team becomes simultaneously incapacitated and replaced by the correspondents from hell (i.e. Nietzsche's Moustache), who
