They present a simple wooden knife that can also be examined.

Then twist the end of the handle as if you were tensioning a spring – and suddenly the knife snaps shut. You can repeat this as often as you like.

However, if a viewer then wants to imitate this, it won't work.

Because the knife obeys only you!

Now a (pseudo-) explanation follows, but when this is checked by a spectator, it (of course!) doesn't work again.

But you have another (pseudo) explanation ready. However, this one, too, quickly becomes apparent as just a way to "fool" your audience.

With the pocket knife you have a good five minutes of fun entertainment in your hand!

The knife is approximately 17 cm long with the blade extended. Color variations from the pictured knife are possible.