You show a device enabling to cut your cigarette filters to your audience.
You begin your demo by cutting a cigarette that you have introduced in the hole. There is no doubt, the cut is clear and the blade is solid!
You ask to the audience is there is any volunteer to probe your cutting device.
When he is closer to you, you hang him a new cigarette.
Immediately you take his finger and you introduce it in the hole of the device.
Suddenly you lower down the blade
But put the audience at rest, you show that the spectators finger is not damaged!!
The device is automatic and is not dangerous!
Sale forbidden to minors.