Imagine standing there, thinking about having a sip of some nature and suddenly the water slowly turns red.
You look up and see a guy holding a chainsaws or taking a piss.
There's an eerie silence as you go up the river bank. The song of the occasional bird has left, and the pitter patter of the squirrel, has stopped. It's as if the forest held it's breath. Waiting, watching... A twig snaps! (<roll for initiative>)
You look up and see a guy holding a chainsaws or taking a piss.