Theatrical performers and audiences aren't the only ones grousing about cell phones. Pity the poor instructor, attempting to hang on to the last shred of her students' rapidly fraying collective attention as she tries to explain the difference between independent and dependent clauses, who just as she hits the high note of her lecture hears that ominous noise--a cell phone's ring-tone. Does the student turn off the cell phone? If our instructor is lucky, yes; if not so lucky, the student cheerfully walks out of the room to do something far more important than absorb basic grammar.
Seriously. It's time to start putting cell phone policies in my syllabi. Now, if only I had a good comeback line. Laurence Fishburne's approach (scroll to bottom) has its appeal, but, um, I'm not tenured yet.