And then, the evil aliens tried to blow their spaceship to bits by firing two missiles at them. But thanks to the "improbability drive" that powered the ship, and an accident that involved trying to compute the finest cup of tea, the missiles were transformed into a bowl of flowers and a whale!
The bowl of flowers, it turns out, was a being that had time and again been killed off on various worlds and in various forms by one of the main characters. Thus it exclaimed, "Oh no! Not again!". The whale tried to be friendly to the ground that was rushing up to meet it.
... Just realized how absurd it sounds when I explain HG2G.