There was absolutely no way David could stop himself from laughing. There was no stifling, no hiding, just an open burst of laughter because yes – they were so mature and he didn't stand a chance. Right now you're the flash drive. Most mature ever. Oh God.
Trying his damnest to regain composure though, it was difficult after commentary like that. The Loudermilks were blatantly confused based on what they heard, which was by all rights a very benign statement that David couldn't even begin to address in comparison. And their expressions really made it all the more difficult to stop the giggles he wanted to fall into. Which was exactly why he just stopped looking at anyone and tried to focus on equally benign things – the floor, for example. Boring old floor.
Cary-as-Kerry, still openly confused about what was so funny, looked at David for a moment longer before returning attention to Syd-as-David. "This is brand new territory, I'd suggest trying just about anything outside of David using his power to fix it. The less psychic influence, the better. This is exactly how we learn our powers and master them, through trial and error." He felt the need to emphasize the error part because it was never flawless. Never. "If it would help, I'd be happy to go into detail of how many errors Oliver experienced. No one starts as a master."
That actually had David sobering up a little. He could only imagine what Oliver might have gone through... though, considering the sixties and the sheer amount of drugs going around back then...
Unless Oliver had been stupid enough to get into uppers at all. Then he would've been asking for traumas and errors.