Equestria & Beyond discussion

In the episode Too Many Pinkie Pies, Pinkie Pie ventures into the Everfree Forest to look for a magical pond that she recalls from a nursery rhyme. She pushes through dense brambles and unexpectedly falls down a hole, but ends up in an underground cavern that houses the Mirror Pond. She recites, "And into her own reflection she stared, yearning for one whose reflection she shared, and solemnly sweared not to be scared, at the prospect of being doubly mared!" and steps through the surface of the pool, successfully cloning herself. This process continues until there are a sizable number of clones, who start overwhelming Pinkie's friends. When all the clones are sent back, Twilight seals the entrance to the mirror pool with a boulder.