After everyone had had their little laugh at Snape's antics, the Weasley twins took out another picture.

"Everyone recognize this professor?" asked George.
"Of course, you dimwits, that is Professor McGonagall," replied a snotty pompous second-year.
Fred glared at him. The second-year then seemed to recall what had happened to Snape in revenge for offending these two and slowly backed away. Fred continued, bringing out another picture to show.
"Well, that is what she looked like before the party. This is what she looked like after a couple of glasses of our special sherry."

"Dumbledore had a lot of fun games planned," George acknowledged, explaining the picture that had caused several students around them to look several times between the two pictures displayed. "They crowned the Twelfth Night King and Queen three days early, had a knitting contest in which McGonagall used her own cloak for yarn, she even played Cupid there for a while."
"I just don't think Dumbledore expected McGonagall to get into a cat-fight with Mrs. Norris and then make up," said Fred wistfully. "Or for her to hold on to everything that she got as party favors."
There were a couple of incredulous snickers.
"You don't believe us?" said George. "How is McGonagall's less believable than Snape's?"
"Look at the pictures, they speak for themselves." said Fred.
"Well, not really," said George as a couple of third years opened their mouths to speak to the pictures. "It's just a phrase."
"But her hair even came down a little," insisted Fred.
"That really is quite extraordinary magic, changing the appearance of a person in a photograph that completely. I daresay Professor Snape would be quite interested in seeing the one you were showing earlier," said Professor McGonagall from behind the twins. "Now, come with me."
"Five Galleons for a camera that can do the same humiliating poses for your worst enemies! See us later to get your own!" shouted out Fred as they were led out of the Great Hall.
There, now, for the next challenge, I want to see your version of Professor Sinestra, the Astronomy teacher.
Note: It doesn't have to continue the party idea unless you want it to.