Rossi watched on in amusement as Emily and Morgan took a wide circle around Reid's desk as they walked past him. Over the past few days, they had been treating him like he was a bomb that was about to go off. Even though the younger man had been acting perfectly normally. Rossi was finding it incredibly amusing to watch. Especially since they currently had no cases to distract them. It was better than paperwork. Not that that was hard.

It had been two weeks since the whole clock incident and Reid striding off with a look that promised retribution. Two weeks. Fourteen days. At least twelve of those in work (unfortunately, apparently bad guys didn't believe in weekends). Twelve days of Emily and Morgan realising that Reid was fully capable of retaliating in a prank war and had the intelligence to do something truly diabolical.

And yet, he hadn't. Not yet, anyway. Rossi was sure that it was only a matter of time because it wasn't like the kid to let a slight like that pass without doing something. That and Reid and Morgan were overdue a prank war.

"Maybe he's not really going to do anything," he heard Morgan say hopefully to Emily.

He didn't hear her response but Rossi shook his head and gave Hotch a grin.

"Surely Morgan remembers the prank war that he and Reid had. Did he really think that he wouldn't retaliate?" Rossi asked in amusement.

"That would imply that Derek or Emily had a thought in their head." Hotch said sharply and then groaned in remembrance of the previous prank war.

"Harsh."

"At least there's not a case this time," he grumbled.

"Yeah, the kid's considerate like that."

Hotch gave him a dark look but Rossi just smiled at him. Hey, he wasn't the boss. He could sit back and enjoy the events that were sure to unfold. It would be good and break up the day a bit. Hotch, unfortunately, had to be the responsible one and automatically disapprove. Even though Rossi knew that he found it at least a little bit amusing, as much as he could when he disapproved of pranks in general. Thankfully, Hotch knew that Morgan's and Reid's were generally harmless and let them be. Profilers had to let off steam somehow and pulling pranks was better than, say, snarking at people to the point that they cried (cough, cough Emily).

"They better hope that Strauss doesn't hear of it," he gave a last grumble before returning to his office.

That was actually a fair point. Strauss would put a stop to it immediately which just wouldn't be fun. He'd have to make sure that she was distracted somehow.

But first he had more pressing matters to attend to. Walking down the stairs, Rossi made his way over to Reid's desk and pulled a chair over to it.

Reid looked at him suspiciously.

"I'm not trying to get whatever you have planning out of you," Rossi assured him which got him a raised eyebrow. "I just want to tell you that I want a front seat to it."

"I think I can make that happen," he said slowly.

"Great," Rossi clapped him on the shoulder as he stood up. "Good luck."

"I don't need it," Reid called after him.

"I'm sure you don't."

They both grinned at each other, making Morgan eye them warily but he didn't say anything. Instead, he reached for his coffee on his desk.

Morgan took a long sip of it only to almost immediately spit it back into his cup, some of it going down his front.

Rossi screwed his nose up over the mess he'd made of himself, having stepped away before he got sprayed with a mouthful of coffee.

He cursed loudly anyway because he felt like the situation called for it.

"Morgan!"

Then he had to jump back because Morgan threw his coffee away from him, causing even more coffee to go everywhere.

"That's disgusting!"

"What's going on?" JJ asked from her desk.

"That was basically all sugar!" Morgan said in disgust, glaring at his spilt coffee.

JJ raised an eyebrow. "Someone got your order wrong?"

"Someone's trying to poison me!" He corrected.

"What? By adding sugary syrup?" She asked in amusement.

"Exactly! That has to be some sort of crime!"

"Sugary syrup is good in coffee," Reid said in an offended tone.

"Not everyone wants to have a little coffee in their sugar," Rossi told him.

Morgan narrowed his eyes at his friend who stared calmly back at him.

"It was you, wasn't it?"

"I have no clue what you're talking about."

Rossi watched Reid carefully and the younger man was calm and collected, not to mention amused but they were all amused at the turn of events.

"You tampered with my coffee."

"I did no such thing."

He tidied his papers into a stack and stood up.

"Excuse me, I need to inform Hotch of something."

"Was that the prank?" Morgan asked hopefully at Reid's retreating back and then looked around the office, trying to check with other people as if they knew. "Was that it?"

"Somehow, I don't think that was it," JJ said in amusement, looking him up and down.

"But I bet he did it. You did it, didn't you?" Morgan directed the last sentence at an incredibly amused looking Reid.

"I told you that I didn't."

"Yeah, but that's how you like your coffee."

"Which the same barista makes for us nearly every day. She probably just got your order wrong."

Morgan narrowed his eyes at him. "Did you get my order then?"

"Nope."

Morgan crossed his arms across his chest and frowned, not knowing what to make of this.

Rossi looked over to Reid, who was now up on the stairs and looked amused but not triumphant or smug. No. That definitely hadn't been the prank.

"You might want to change your shirt before you get all sticky," Reid advised him before going in Hotch's office.