Snape's all right, I guess. But I can still find some ways to bash him.
Hermione said in a worried voice, "Harry, this is definitely against the rules!"
Harry just shrugged and said, "I need to prove to Dumbledore that Snape is seriously bigoted and biased."
He downed the Polyjuice Potion, turning into a lookalike of Draco Malfoy. With a sneer on his face, Harry coughed a few times and said in Malfoy's voice, "Right. Give him the Polyjuice and compulsion potions, then come and join me in the Potions classroom."
Ron and Hermione nodded, then started pouring the potions down the real Malfoy's throat. In the meanwhile, Harry perfected his smirk as he went down to the dungeons.
An hour later, Snape finished the Potions lesson. Draco had been exceptionally good that day, and he made sure that everyone knew. At the end of the lesson, "Draco" suddenly stood up and said loudly, "If I could please have everyone's attention!"
Everybody stopped and looked at him, wondering if Draco Malfoy had gone mad. 'Draco' continued, "I have been exceptionally good today, have I, Professor Snape?"
"Yes…" Snape agreed warily.
"Then," the Malfoy lookalike said, "Why don't you say this to Potter?"
If the whole class suddenly jumped up and streaked in front of Snape, he couldn't look more shocked.
'Malfoy' continued, "I am just acting the same as I do every Potions class, sir. Never before have you complimented my Potions skills - except when I have Malfoy's appearance."
'Malfoy' suddenly changed back to Harry Potter. He finished, "It seems to me that you are very biased, sir."
Snape spluttered madly as the entire class filed out.
I can't write well now… grr.