Every DM has a player who they feel will never take certain actions. Like the player who enjoys their smashy barbarians and fighters who you'd never expect to play a pacifist cleric. Or the one person who doesn't want to roleplay. Or the one who doesn't want to participate in combat encounters. And then one day, hell freezes over. They change their mind or something shifts in their brain and they're off to the races trying out ideas you never thought they'd even touch. And you cry tiny tears of joy as a DM that you can never let them see.