"Spontaneous? I don't know about vampies, but it doesn't have to be something big. You don't have to jet off to the Vegas galaxies or anything. Start small. Go for a walk, enjoy the fresh air, go to a movie. Get out of your rut."
Though it might be said that being spontaneous was the Doctor's rut. He couldn't handle the normalcy of day-to-day life. It just was so boring in comparison.