Did you laugh at what you just saw or find it funny in any way?
If you answered yes, Seth McFarlane could not have possibly been involved. *
If you answered no, there is a good chance Seth McFarlane may have been involved.
* - If, in fact, Seth McFarlane WAS involved in what you just saw and you found it funny, you may want to consider seeking professional psychiatric help.
If Seth had done this, the entire sequence would have been a shot-by-shot remake of a scene from either The Breakfast Club or Footloose, only at the end everyone vomits for ten minutes.