I can totally imagine David and Gillian having a break on set and being bored, and David taking out his cellphone and Gillian being all smiley, childish and curious asking « What are you doing? » while bumping her shoulder to his, and him answering her without much details, relaxed yet engrossed in his phone, trying to get things right. And then Gillian deciding to do the same, like a young girl copying his classmate, as she’s realizing she isn’t getting much attention from him at that moment. 😋