The main point was she never wanted Brian to be right so therefore he never was right, got it? Things don't always have to be logical anyway, that's boring. And from time to time it was fun to try and poke fun but as much as she hated to (and never did) admit it… Clarice never really won.
At the sound of his voice Clarice jumped slightly, though luckily caught her balance before she, too, fell to the floor. No sister talk! It was too weird and disgusting being related to him, honestly. Jared she could handle, Brain not so much. "I was going to clean it up," she said turning around to face him, clenching her jaw. Clarice should probably work on her short temper because him just stepping into the room shouldn’t make her want to punch something.
At the last bit she narrowed her eyes in a glare, "How about I pick up another box and dump it on your head?" she finished with a sarcastic smile, turning away again to continue her search. He could be ignored.