When two performers of the Broadway show 'Wicked' actually performing Elphaba and G(a)linda exchange roles. Thus, the actor performing Elphaba becomes Glinda and vice versa. This situation may occur for any given purpose such as singing parts at any event or live performance or fun photos.
Libby Servais and Felicia Ricci did a Witch Switch the other day for fun. Lucy Durack and Jemma Rix did the same thing for a live performance and Megan Hilty and Shoshana Bean same thing.