“Hey Pinkie, you wanna know something really cool about that drug I gave you?”
“What’s that, Nav?”
I smiled. “You can bake it into brownies, and you won’t notice the taste until you’re already high.”
Her smile matched my own. “Prank time?” she asked.
“Prank time,” I answered. I had already prepared the rest of my small stash, and gave it to her with a bit of instructions. She ran off into the night, giggling like a madpony.
The next day, half of Ponyville came down with a serious case of baked-off-the-ass. It was hilarious. Spike and I walked around town the entire day, messing with people. We saw Pinkie and Rainbow Dash doing the same thing, and greeted them with bro-fists.
“Well Nav,” Rainbow was saying, “you’ve pulled pranks with me—and on me—in the past, but this takes the cake!”
“Or the brownie,” Pinkie said with a giggle.
“That too,” Rainbow continued. “But this… this is awesome! We have half the town completely out of it! I saw Applejack hugging a tree and apologizing for bucking it so much. Big Mac was actually crying at her shoulder for a moment before joining her in hugging it!”
“And I saw Lyra using her hooves to try to play her lyre,” Pinkie said. “I don’t know how she was expecting to play it, but she had such a massive smile on that I couldn’t bother her.”
I said, “I heard Zecora talking earlier. Normally she rhymes in a simple pattern, but today she was changing patterns every few sentences. I think she even stopped rhyming, at one point!”
Spike said, “Twilight was trying to study today, but every time she pulled out a book, she forgot what she was looking for. After half an hour, she finally gave up and just built a book fort. When I left, she was gearing up for a siege by the pony-head statue.”
https://www.fimfiction.net/story/45860/45/diaries-of-a-madman/chapter-fortythreeweed-and-promises-made