One chilly afternoon, Wolverine stood in front of a McDonald's diner in Oklahoma, holding a cup in his hand. The mutant was wearing his trademark yellow spandex costume and mask with a scowl upon his grizzled face.

"Looks like I'm takin' the Grimace challenge, bubs." He said, "Because those bozos kept goading me into doin' it. Okay, down the hatch."

Wolverine raised his Grimace cup and placed the straw in his lips. He began to sip the contents of his cup, every last inch of it, no matter what happened. He sipped it all and then, he put down the cup with a smug grin. Wolverine waited a minute; they said something bad happened if one drank from the Grimace cup. However, nothing happened.

"Heh, that wasn't so bad." The immortal mutant chuckled.

Just then, his legs buckled and he yelled, clawing at his neck and coughing. Wolverine stuck his tongue out and doubled over. Then, he struggled back onto his feet, grunting and coughing some more. He spluttered, then he wheezed, and coughed a little more.

Wolverine composed himself, letting the Grimace settle. He remembered that he had a healing factor, which was now kicking in. Someone had put something in that drink, which would have been lethal to the man known as Wolverine had he not been immortal with a healing factor and had those claws.

"Well, that was somethin'." Wolverine remarked, "Let's see how I handle another Grimace drink here. You bubs have some crazy trends going on..."

"Isn't it my turn now?"

"HEY!"

Deadpool turned off the recording and put the phone down. "C'mon, Wolverine. I know this story is called "Wolverine Tries Grimace", but you invited me to take the challenge as well."

Wolverine scoffed, "I invited you to record me with that camera, bub."

"Sounded like you wanted me to join your challenge."

"Okay, fine. You wanna have a go with that Grimace, we'll have a drink off. Think your body can handle it too, Wade?"

"Yo, what are you doing calling me by my first real name? Most people don't even know who we are under those masks, you want to expose our identities. And for crying out loud, some of the readers might be new Marvel fans who know nothin' about Deadpool and the Wolverine and likely dunno a thing or two about secret identities."

"Quit your yappin' and drink some Grimace!"

"Honestly, this is kinda ridiculous that we're trying our hand at a parody horror meme that started spreading around in the past month, no thanks to some weirdo on TikTok."

CLUNK!

Wolverine threw a Grimace shake at Deadpool and the merc with a mouth caught it. Deadpool rolled his eyes and lifted up the mask, slightly revealing the chin and mouth on his scarred face. Wolverine grabbed a full Grimace shake and stared at his rival/friend. Deadpool stared at him intensely, clutching the cup a little harder.

"To mutants with healing factors!" Wolverine raised his cup.

And then, he drank.

Deadpool drank the Grimace as well. Wolverine drank every last ounce of Grimace from the cup, and then he threw it aside before Deadpool finished his cup. The merc threw it towards a trash can and put his mask back on, facing the Wolverine square in the eye. And then...

"AH, SHIT! MY LUNGS!" Deadpool doubled over and coughed, "A-AND I THINK MY HEART STARTED ACTING STRANGE! Oh, and I have brain freeze!"

Wolverine coughed and doubled over, hacking and groaning. He straightened up, watching as Deadpool rolled around on the ground, coughing and yelping. The Wolverine laughed as his rival dealt with the effects of the Grimace. Deadpool cursed and coughed, then he got back up and looked at Wolverine with a dazed look on his face.

"Man, this story feels like a wonky fanfic made by someone who will write about ANYTHING!" Deadpool groaned.

"At least this isn't taking place in one of our comics." Wolverine joked.

"Okay..." The merc with a mouth groaned, "Roll the credits before this gets weirder..."

Deadpool pulled out his phone and clicked a picture of himself with Wolverine and a Grimace shake in the parking lot of McDonald's. The merc with a mouth began posting it on his social media feed and typed: 'Wolverine partakes in Grimace Challenge with Deadpool. Story is over...'

The End

"You gotta admit that was bullshit." Deadpool quipped, "I mean, what's next?"