Everyone knows Pinkie Pie and her love of smiles. But why is she so eager to smile? Why is a smile her most valued possession?

For a person to truly value a smile, there has to be an event, a catalyst that makes them value happiness above all else.

For Pinkie Pie, that event was Sunshine; the sick Pegasus.

Edited by Fernin.

Not too long before Luna's banishment, her and Celestia found the 7th Element of Harmony. This element was known to corrupt the wielder if they are not the correct one, and Celestia's mind has been set to tyrant. One thousand years later, Luna has once again returned to Equestria, but Celestia's evil plot doesn't end there.