This is one very good effect that gets amazing reactions.
You do need to prepare the bottle away from view which only takes a minute or so, but you are left clean at the end, maybe a bit wet as well!
Pushing the cocktail stick into the bottle looks fantastic and adds to the impossible nature of this.
You will need to buy refills after a while but you do get enough to last for a lot of uses.
It's easy to do and plays well.