Creepypasta-something passes whistling trough the hallway in my builging every time at 3:00 A.M

This is now normal for me that creature, wich i had never seen, passes trough the right hallway just near my door whistling, it's not so bad when you get used to it, an hopefully, everyone also heras it, but i can't forget the first time i heard it i felt terrifed beacuse the only one who whistled at this building was the janitor but he was gone at that hour so THEN i couldn't be him, i was just freezed of the fear so i went outside and just saw a big pile of chains moving slowly.

Some told me the story of that mysterious goul: 

he was a janitor who obiusly whistled, and sometime whe got robbed in that EXACT SAME
HALLWAY but he didn't wanted to give away the money so he got killed there, the thing is that the ghost doesn't wants revenge or anything it just wants to scare people, just for his own fun. But you can't see him not literally if you see him you'll die. If you leave a cigarrete at your door it will leve you in peace, what a realief.