All the blood pouring out of my mouth and onto the shower floor was enough to turn the water a disconsertingly dark rusty color. I hadn't noticed a problem until I turned to spit, as I do constantly while I shower, and the spit was a bright undiluted red, but bloodier. I spat again. Same result.
Now my mouth was filling with that metallic tang, and I don't know why I hadn't tasted it sooner, except that maybe shampoo flavor is stronger than blood flavor. I searched my mouth with my tongue, fearing to find a tooth missing. I got panicky when I didn't find such an easy explanation, and tried to remember what happened to patients on House who start spitting up blood from their innards. The rate of flow stayed strong, and I considered whether I was more likely to die from bloodloss, or from whatever horrible thing was causing the hemmorage.
About 10 secs after I first noticed the problem, I finally put my hands to my face and discovered the source of blood was just my goddamn nose. Which had been my first thought, but my nose felt so untroubled in that shower. The warm water was pouring down my face and causing the blood to drop from my mouth and chin instead of from my nose. I had been completely taken in by a normal winter nosebleed, momentarily fearing for my life, because it had happened under slightly different environmental conditions than I was used to. Namely, school desks.