Test it on one of your roommates

You decide that its best to find out, if the choker actually had an effect on people who wore it, or if you were just going crazy. But how would you get one of you roommates to wear it?
You could hardly just go up to them an tell them: "Here, go try on this choker real quick. No..you needed to be more subtle."
So instead, you decide to rely on the chokers seemingly hypnotic powers. If you got one of your roommates to take it, you cant imagine they could resist-given, you werent just imagining all of this.

So, after getting dressed again, you grab the choker and sneak out of your room. You feel nervous for some reason, you dont want to be caught carrying this choker. But you manage do make it to the living room without running into someone, and place the choker on the living room table. It feels weird putting it down, almost like it was urging you to keep it.
Then, you grab your video camera from the shelf, and position it in a way that it records the table. After that, you drop a couple of books, creating a loud noice, before quickly going back to your room.

Back there, you wait, for 15, maybe 20 minutes. As you leabe your room again and go into the living room, you find the choker gone, your plan worked. Heart beating, you grab the video camera and, back in your room, replay the recorded video.

You watch as, seconds after you vanish from the living room through one door, another door opens and one of your roommates come in. They go over to pick up the books, but halt in their steps as they see the choker. Slowly, they pick it up and look at it for a second. Then, choker in hand, they leave the room again, having completely forgotten the books.