In Shrek (the first film of the Shrek franchise), an alternate opening was story boarded but never filmed, called "Fiona's Prologue".
In it, Fiona was born an ogre, which was why she was locked in the tower. She goes to a fortune teller (who was the inspiration for Fairy Godmother) for help. She gives Fiona a choice between a beauty potion or a happily ever after potion. She drank the beauty one, which gave her the same curse she had in the actual film — human by day, ogre by night.
But what would've happened if she had drank the happily ever after potion? Would it have the same effect as it did in Shrek 2: turned you beautiful and you have to kiss your true love prior to midnight to make the effects permanent?