
Image source: https://laughingsquid.com/wp-content/uploads/2017/08/rubber-chicken-head-chorus.png?w=750
If you love to do magic that will have people talking about you for months on end, this is the trick for you. This trick has been performed by various other magicians, and it never fails to shock and amuse the audience at the same time. This does require a couple of hard to handle props, and some practice. This is definitely not a trick to spring on your friends after a couple of beers.
Here's how it looks to your unsuspecting audience, who will soon be wondering if you recently escaped from the mental hospital. You tell them you have suddenly acquired special voodoo powers from an ancient priestess you happened across in a bar recently. Or you bought a magic voodoo trinket or something. You then produce a chicken. (Yes a real, life chicken.) You hold the chicken to the crowd, and let them check that it's a real chicken and not a fake one.
You then describe in detail how your magic voodoo powers allow you to rip the head off this poor chicken, and re-attach it. They will, of course, wondering if you've lost your marbles. A few may even be on their cell phones to the police, so you'd better hurry. While you are describing the history of voodoo, and how it gives you magical power over animals, you rip off the chickens head. You show it to the horrified crowd, and then quickly re-attach it to the chicken, and let the chicken run away. (Hopefully before the cops show up.)
Here's the trick. Before you do this, you'll need a fake chicken head. You get these from hobby shops, or anyplace on the Internet. While you are telling the audience of your magical voodoo powers, grab the chickens head. Naturally, they won't be watching too closely, and will most likely be ready to turn their heads in disgust should you be crazy enough to really pull off a chicken's head.
While they are getting ready to recoil in horror, you simply take the chickens head and tuck it under her wing. If you hold the chicken under your left arm, you can keep the fake chicken head in your breast pocket. People won't be looking nearly close enough to see you pull this off. Then when you tuck the chickens head under the wing, pull out the fake chicken head, and quickly thrust it in the face of a few audience members. Do this only for a couple of seconds. Then reach back, put the fake head in your breast pocket, and pull the chickens had out from under it's wing. If you want you can toss the chicken at the audience, further scaring into insanity.
After the trick is over, you can return the chicken to its owner (if you borrowed it from a member of the audience) or simply let it go, or give it to your assistant. Just act like pulling off a chickens' head and replacing it is an everyday thing for a voodoo master like yourself. Then casually go on your way as if nothing has happened.