I'm a sucker for "lost memory" stories even though I think it's a trope full of lazy cliché, especially in games. Too often it's a matter of convenience and makes it feel like the designer didn't quite know how to begin a story so he or she washes the main character up on a beach with a healthy case of amnesia. The character innately knows how to summon a two-headed, acid-breathing dragon, SURPRISE, which is the only way to defeat the evil sorcerer, SURPRISE!
The player is never surprised.
