Upstairs Leak

The psycho upstairs neighbor has a leak in their pipes, so we’ve got a trickle of water down the wall and into the cabinets.
It’s their kitchen sink’s drain pipe, so it’s the crap that’s going down their sink.
And it stinks.
I put on my shoes and get ready to walk upstairs to yell at them to stop using the sink when I notice that the water’s turned from clear… to red.
I rub my finger on it.
It feels like… blood?
I calmly sit back down, pick up the phone, and call maintenance.
Their problem, not mine.