You display a regular-size soda bottle which the audience can clearly see through. Removing the cap, you caution the audience not to blink as they are about to wit-ness the inexplicable. Instantly, you throw the cap into the bottle, penetrating matter through matter! One second it's on the outside, and the next second it's trapped inside the bottle! Now, for the kicker - immediately the bottle with the cap inside is placed in your audience's eagerly awaiting hands defying all attempts at explaining the cap's mysterious penetration into the bottle. After the audience returns the bottle, the performer shakes it and the cap melts through the bottle a second time, thus escaping to the outside. Very easy to do and resets instantly!