Derrek did what every rational human does before entering a toilet. He checked the air. A quick double sniff told him it was safe to enter. There was a distinct smell, like most toilets have, but no brown alerts.
With the door on a creak, he saw the sink, to the right of the room. He stopped opening the door any further. What's that? It seems filled. He held his flashlight a bit higher to shine from another angle. The sink was filled to the brim, with water, and something dark. Hair? Derrek felt his stomach turn. Not from what he saw here. Somehow, the memory of opening his shower drain came to mind. He had pulled out a clot of hair then, which was foul of itself but the smell… the smell was way worse. He smelled that now, even while it wasn't there. He hid back behind the door and swallowed. I'm not touching that. I'd rather eat my hat then touch that.
He took a few seconds to recuperate, but the chanting in the room behind him pushed him on with some urgency. He shone back inside the toilet, averting his eyes from the sink. There was a mirror above the sink. Ah, no drawing or message? Missed opportunity. Beneath the sink, were two wooden closet doors. Nothing special, he opened the door further. He had to open it whole before he could see the toilet bowl.
The lid was closed. Something seemed off as well, there was something black on the side of the lid. Yeah, obvious trap. I'm not going to… But what is it? What could you hide in a toilet? Pop-out spider? He stood there watching the closed lid. Thoughts running through his head of what it could be. I can't even recall any movies that did anything gory with a toilet. This could be something original… Am I going to leave this in the unknown? I can always come back later. Or. Or. I could take a quick peek? He edged his hand toward the lid, feeling like a little kid that finds a button to press. Or well, just about anyone who finds a button without a tag. Most would go and push it. It's someone inviting you to an action. Here someone put effort into preparing this surprise, requiring an action.
His hand was almost on the lid, when something clattered further down the hall. Focus Derrek, pull your head out of the toilet. First things first. With some effort, he removed himself the toilet.
The lid remained closed.
The black thing —which wasn't black— remained unseen.