Well, psychic researchers have found that the presence of ghosts is often indicated by a startling drop in temperature.
So, while you were in the tub...did it seem a bit...crowded? Did you hear a voice saying, "Hit the timer again, dude, for another 15 minutes."

Look at the bottom of the wide door or mwindow. A skeleton-like creature is struggling to get onn its feet. Also, to the left of the big lintel over the same opening is a tiny aperture with a skull-like face trying to emerge. (Shudder)

There is a hunched over figure in the big middle window as well. It looks like someone preparing to jump down.