I would not get into it. I've learned getting into or starting anything out of the norm at work always comes back and bites you in the ass. People like routine and when a really stupid and childish thing like a noose or whatever it might be is found or said it stirs up the pot. Everybody starts talking and taking sides. It gets ugly. IMO ONLY
OR
1. Go around w/ noose until you find the fucker who made it or brought it to work and kick the shit out of him or her.
2. Go to boss and threat them w/ lawsuit.
3. Simply throw away and go about you day.
Thats some deep shit though - Good luck. - PEACE