It started off as a group of rl friends doing various improvs with only one line of dialogue - Are you really there? It started with all of us singing it in various styles, then it kind of shifted to a student-film of all the situations where that would be the line - a mother yelling it into the telephone when her son calls from the police station, an old woman waking up after surgery, a teacher asking a daydreaming student.
What scene would you add?