"As a matter of fact, I did have an appointment," James replied, keeping his voice light and airy. Cheerful, even, because he knew it would just continue to annoy Snape, and annoying Snape was one of his favorite things. Even if they were all supposed to be adults and far beyond schoolboy grudges. Somehow he didn't think he and Snape would ever be beyond schoolboy grudges.
And because he wasn't so far beyond a schoolboy grudge, he added, "I think Albus is going to be offer me the Defense Against the Dark Arts position," James said, throwing up another lemon sherbert and catching with a showy flair. "So it's a wonderful coincidence that you're here! How do you find teaching at Hogwarts, Severus? Just think, in another couple months we could be colleagues."