Unsurprisingly, Greg didn't really get the joke. As far as he could tell, this was Draco being Draco - which, in a way, was also comforting. "I'm sure you'll do good," he eventually said, "you're good at potions and all." It was more of a matter of only knowing the right amount of eggs to use only as he was breaking them, though he didn't know if this was silly or not.
"What d'you mean with doin' better with your quill?" he asked as he broke the eggs. That was something else Draco had said that he didn't really understand.