Everyone here has some awesome explanations! I'm pretty sure it's not a light leak, though...as I did get that fixed. Breath condensation is a good one. Shocking the emulsion is a good one. Even the developer could be something...not too sure about the mold/fungus, though. Maybe the boy funk fumes in the bathroom that serves as my darkroom?
To be honest, I like the 'ghost' idea best. I'd LOVE to get more 'ghost' pictures! I'm going to load her up again tonight and leave her in my attic (totally empty) for the night and see what I get in the morning.