i was taking a shower last night and while rinsing my hair, eyes closed, i heard what sounded like a quick, quiet double-knock on the half-open bathroom door. we used to do that when one of us was walking in while the other was showering so as not to startle them into massive head trauma, i guess. i immediately looked up, and stood quietly, but nothing. back to showering, then i heard it again and my chest tightened.
the water was falling from my head and dripping onto the shower curtain liner just so, making the sound.