Contumacious: stubbornly rebellious, willing disobedient

"Mr. Black. What are the five laws of elemental Transfiguration?"

Sirius Black happened to perk is ears toward Professor McGonagall, miraculously. Still, he didn't look up from his note to James, let alone answer the teacher's question.

"Mr. Black, kindly start paying attention to the lesson," the professor approached Sirius's desk and rapped it with her cane.

"No thanks, Professor," Sirius said mildly. The class looked at him incredulously. Then again, he was Sirius Black.

"Black, that's an order," McGonagall's nostrils flared. "Now answer the question."

Sirius smirked. "I don't think so. See, this is boring me."

"Black, you are doing this purposefully," McGonagall frowned severely down at him.

"Looks like we're finally catching on, Professor," Sirius grinned.

Remus and James both sent Sirius a warning look – At this rate, he'd have detention for a week.

"Black, you are infuriating," McGonagall's eyes narrowed. "10 points from Gryffindor, and an essay on my desk tomorrow on the laws of elemental transfiguration."

"Not likely," Sirius drawled. "Tonight I was thinking of sneaking to the kitchens at midnight, you know, just for fun….oh, sorry, you don't know what fun is, do you, Professor?"

That was the last straw. McGonagall's eyes ignited with fury. Everyone in the class's thought was the same.

Nice knowing you, Black.

"Sirius Black!" She shrieked at the top of her lungs, causing many students to wince and put their hands over their ears for fear that their hearing would be implemented. "You are the most annoying, insufferable, contumacious boy I have ever had the unfortunate luck to meet! You try to be like this! It is a conscious effort! Thirty points from Gryffindor and detention with me for two weeks!"

"Sure, Professor," Sirius said, unfazed. "Sure."

Sirius Black: Otherwise known as 'The One That Pisses McGonagall off Every Five Minutes And Doesn't Care One Bit When He Receives Detention'