PoA Headcanon:

Fred and George have a tradition of pranking the new DADA teachers, because of course they have. If they get a new teacher in this subject every year, they might as well make good use of it. Let them know what their in for.

Naturally they tried this with Remus Lupin as well. Easy prey, they thought.  Gentle, kind, competent. We’ll go easy on him, they thought.
Their plan was, thus, very simple. They would, during the lesson, smuggle some stink bombs in their new teachers bag. They would go of when he next puts that back down, hopwfully either in the staff room or in his next class. Annoying, but harmless. Professor Lupin had made a good impression on them. He deserved to be eased into it.

This, of course, proved to be their mistake.
It went over smoothly, as it would. It was, after all, so simple, so uncomplicated. Until they walked into their next class, put their bags down and the smell of ten stink bombs gone off all at once hit them.

After that, it was war.
The twins, desperate not to be upstaged by a teacher, came up with more and more complicated schemes, but every single one got fired back at them. Remus, at the same time, developed a reputation. He humiliated both Peeves and Snape in front of students within one hour. He was generally witty, nice and an incredibly understanding teacher. He always felt eyelevel. About a month in, the twins ceased their pranks. Professor Lupin was a man after their own hearts (or, they suspected, they might be after his). They made peace.

None of this was ever discussed between them. Neither ever braught this up, not even when the twins found out who Moony was. Although they were tempted, this had already become the thing they didn’t talk about. Their silent war never affected their interactions. And, in some way, they respected this about Remus the most.

“‘Give her hell from us, Peeves.’
And Peeves, who Harry had never seen take an order from a student before, swept his belled hat from his head and sprang to a salute as Fred and George wheeled about to tumultuous applause from the students below and sped out of the open front doors into the glorious sunset.” #fredweasley #georgeweasley #harrypotter #mischiefmanaged

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  • Professor Snape:[looking at the Twins terrible attempt at the Potions project] You've gotta be kidding me.
  • Fred:Remember, if you fail us -
  • George:you get us again next year.
  • [later in the Common Room]
  • Fred:Acceptable, ladies and gentlemen! We are below average!
  • George:Below average!
  • Both:Below average!

Okay, but I have this headcanon that during OotP, after Dumbledore left Hogwarts, Sirius and Remus spent a night writing a list of things that could be done to Umbridge and then send it to Fred and George with a letter. It read:

Dear Successors,
Our schooltime is long past, but we understand that Hogwarts students are in dire times these days. So, as purveyors of aids to magical mischief-makers, we find it is our duty to aid you as best we can. So we have enclosed a list  of possible michiefs to help you.
Make no mistake, we, especially Mr Moony, are well aware of your creativity and resourcefullness and respect you deeply as worthy successors. However, we head way to much fun imagining all of these pranks not to send them to you (Also Moony, and therefore both of us, possess a personal hatred of Dolores Umbridge and wish to see her suffer.). May you find further inspiration in this and send that terrible bitch to hell on a daily basis from now on.
Do us proud,
Messrs. Moony and Padfoot

And how did they get it past Umbrigdes post control, you ask? McGonagall delivered it for them. And she smiled everytime she saw the marauders handwriting shining through the twins pranks. Not that the twins didn’t have plenty of original pranks.
The twins? Well, they fangirled when they got the letter and made good use of it.