Imagine a very fast bowler. The ball pitches, is missed by the batsman, is missed by the wicket keeper, and flies over the boundary. How much runs/extras?
Imagine a very fast bowler. The ball doesn't pitch, is missed by all, and flies over the boundary. How much runs/extras?
Bonus: Did either ever happen at some reasonable level? (The first might be physically impossible, but the second seems doable.)