Finger
"Christine! What did I just see you do?" Brennan yelled at her daughter from the kitchen.
Booth popped his head out of the bathroom door, half of his face covered with shaving cream. "What's all the yelling about?"
Brennan walked around the dining table and glanced towards Booth "I just saw your daughter stick up her middle finger at me!"
Booth stifled a chuckle as he walked towards her, wiping the shaving cream on a towel.
"This is not funny Booth. She just tossed a bird!" she said, making Booth burst out laughing.
"Flipped the bird Bones. She just flipped the bird." he said, defensively holding up both hands and trying to look serious. "and no. You're right it isn't funny. I'll go talk to her"
Booth walked outside, and went over to his daughter, squatted down and stared at her. "Christine. Mommy said she just saw you do a rude sign with your finger. Did you?" he asked.
Christine turned, eyes wide and brimming with tears "I hurt my finger Daddy. See?" she said, holding up the injured middle finger of her hand. "I tried to show Mommy but she didn't see me." her voice wavering slightly.
Booth clamped his mouth shut and turned to look at Brennan through the window. "She hurt her finger" he said, deliberately not quite loud enough for her to hear, holding up his middle finger. A huge grin broke across his face as he watched Brennan's mouth drop open.
"Come on baby. Daddy will fix it for you." he said kissing her finger and picking her up to carry her inside.
"Sore finger Mommy." Booth said as they walked past Brennan. He turned and looked back at Brennan winking as he carried Christine to the bathroom.
"Just a sore finger"