Slenderman tabletop RPG interactions

GM: You look out your window and see-
PLAYER: Fuck it, I don't want to know. I'm rolling a Sprint.
GM: ...a mailbox. You see a mailbox.
PLAYER: I got an eighteen on my Sprint, with a +3 modifier from my Sphincter-Clenching Terror feat.
GM: Where are you even sprinting to? You're in a third-story apartment.
PLAYER: The closet. I hide in the closet from whatever the fuck that was.
GM: You hide from the mailbox.
PLAYER: Yes.
GM: The closet is full of impossibly long black suits on hangers.
PLAYER: I roll Urinate off of Wisdom.