Retromimesis

Retromimesis is a type of transformation spell in which the caster locks eyes with his or her subject and both the caster and the subject physically switch appearances with each other. It was first used in the Smurfs comic book story "Smurf Versus Smurf" when Papa Smurf and Gargamel switch appearances so that Papa Smurf could stop his little Smurfs from fighting with each other. This is also used in the cartoon show version of "Romeo And Smurfette".