Margaret sidled up to Harry Potter in the hallway between classes. "Hey, Harry, what are you going to be painting for the big final in art class?"
Harry tried to look nonchalant. "Oh, I don't know yet. I'm trying to decide between a portrait of the Surgery-ician school Council of Magic-Throwing, or the minefield behind the school."
Suddenly the loudspeakers squawked to life. "Attention all personnel! Incoming wounded! All surgeons report to the O.R. immediately! This does not apply to all surgeons that are in a secret magical society that the other surgeons don't know about!"
"Whew," sighed Harry, "that was a close one. Now I can work on my art!"
... later on in the book ...
Harry spoke the Spell of Healing, and Hawk-Eye's gaping wounds closed up like a bloody red eye winking, but only doing the first half of the wink, where the eye closes. So they didn't open back up again, is what I'm saying.
"Thanks, Harry," Hawk-Eye gasped. "Looks like I owe you one."
"Actually, Hawk-Eye, you owe me at least seven or eight."
"Right," Hawk-Eye said, "but who's counting?" He then laughed uproariously for at least a minute. The laughter eventually trailed off, and Hawk-Eye stared morosely out the window. "When is this damned war ever going to end?"