As Stormy was (unwillingly) getting ready for his first day of being a good guy, he comes across a former associate of his. One with a distinctive mohawk and an even more distinctive broken horn.
"Tempest" Stormy said, with mild disdain
"Storm King" Tempest said in the same tone
"No one, not even myself, is allowed to call me that! I now have to be called 'Stormy', I HATE IT!"
"Better than Fizzlepop Berrytwist, that's for sure"
"What are you doing here anyways? I thought you'd be friends with the ponies by now"
"According to the draconequus, my appearance frightens the other students, which is ridiculous because this school has changelings for students here"
"I'm just here for the cake" said a familiar lispy voice behind them. They both turned around to see Grubber, enjoying a massive cake that on top says "Welcome to being good".
"Oh, and Grubber talked me into it" Tempest said
As the three waited in the classroom, Discord walked in wearing a wig, a black cloak and talking in a funny voice that I..and Benedict Cumberbatch...can easily...impersonate.
"There will be no wand waving and silly incantations in this classroom, I am Professor Disnape, I mean Discord, and I will be teaching you how to be good guys"
Grubber put his hand up
"Yes....Grubber?"
"Do we get to play trumpets?"
"No...that's for when you're being taught.....how to be.....villains, we do not have a class for being villains for obvious reasons"
Five hours of explaining the basics of being a good guy, much to the frustration and boredom of everyone in the class (including Grubber) Discord proceeded with the first exercise of being good, along with the strapping tickle belts on everyone as they snoozed or in Tempest's case lying there looking absolutely bored. He teleported everyone out of the classroom and played a trumpet very loudly to wake everyone up (and no, he did not play "We Are Number One" because that is for villains).
"Goodness lesson #1, you see someone drop their.....wallet, what....do you....do?"
He then tells Grubber to drop his wallet and then tells Stormy to pick it up and give it to Grubber. Simple enough, right? Buuuuuut since this is Discord we're on about, he's not going to make it easy.
"Uh, Stormy? That's not my wallet"
"What?! But I just saw you drop it!"
"Yeah, but it's not mine"
"What are you saying, that you just picked up a random wallet and decided to throw it on the floor for no reason?!"
"I did drop my wallet, but that wallet isn't mine"
"Well, it's got your ID!"
"Yes, but my wallet is black and had your logo on it"
Stormy growled and grabbed Grubber by the throat "Listen, Grubber" he said in a deep, snarling voice "If you don't accept this wallet that I took the time of day to pick up, I will make all of your teeth look like Tempest's horn"
Then Stormy fell to the floor clutching his ribs while rolling on the floor laughing until his aformentioned ribs ached.
"The real lesson herrrre is to have....patience and to realize you can't snap.....your problems away" Discord said as he snapped the wallet back to being Grubber's wallet.
The next lesson involves Discord having Grubber lift a heavy package (along with him promising Grubber that he won't use his magic to mess with them this time) in order to teach Stormy how to help people when they are clearly struggling rather than with something that wouldn't be noticed later such as a dropped wallet. However, due to the package being ridiculously heavy, Grubber could barely hold it, causing him to drop it on Stormy's feet. Multiple times I might add. When Stormy opened the box to find out what the heavy thing annihilating his feet were, he discovered, much to his extreme frustration, that they were Storm King brand wallets identical to the one Grubber has.
"RRRRRAAAAAUUURRRRGGGGGHHHHH!!!!!!"