Moneymorphosis by Dallas Fueston and Jason Bird

This is, quite simply, one of the most impactful, poetic effects Vanishing Inc. has ever produced. A borrowed bill self-animates and crawls up your arm like a caterpillar. Then, it transforms into an origami butterfly! The folded butterfly can be immediately handed back to the spectator as a souvenir of an unforgettable magical experience. 

The best part is that the effect is practical. You can perform it surrounded, and although it uses threads, the approach is entirely workable and easy to manage, and can be mastered within minutes.