The pratfalling heroine
Notable offenders: "Miss Congeniality," "The Wedding Planner," "Just Married"
Those silly women, so inadept at walking! Because she's a lady, our lovely heroine's self-esteem must be undercut by a lack of equilibrium whenever her confidence temporarily skyrockets. The raison d'être of rom-com heroines is to be a living set of "relatable" attributes while never straying too far into actually being human, and apparently "relatable" means bumping into walls and being kinda goofy (but not eccentric!). And also conventionally attractive, and thin. And white! Did I mention that last part? Sorry, Regina King.