Afternoon, three o'clock.
There was a knock on the door. Butters instructed his robot pal to answer it, and he could see the strange looks in the eyes of his friends just before he asked, "Who's at the door, AWESOM-O?"
"Three boys named Stan, Kyle and Kenny," the robot replied.
"Aw, hey, fellas! I see you met my robot!" Butters said.
Stan proclaimed flatly that AWESOM-O was cool, and Butters told the boys about the slumber party they'd had the night before, before Butters commanded his robot to go get drinks for his friends.
Kyle and Stan eyed each other, and Kenny just kind of looked away. Meanwhile, Butters removed a small hand-held camera's video tape from his pocket, and held it out to them. "Fellas, I need a favor. And... Wul, I know I don't ask too much from ya, so if you could just do this one thing..." He looked back toward the kitchen.
"...Butters?" Kyle asked.
"I'm pretty tired of Eric messin' with me. I've about—I've about had it up to here," Butters stated, patting the underside of his chin with the back of his hand. "So this... Wul, I'm just waitin' for him to slip up, and he will, but in the meantime, I'm kinda going to... To, you know, mess with him a bit. But he's lookin' for this tape, and he can't find it."
Somewhat incredulously, the other boys looked among one another. It was Kenny who finally asked, "Dude, you know that's Cartman?"
Almost at the same time, Stan asked, "What's on the tape?"
"It's a surprise," Butters said. "But trust me. You keep that safe, and – Well, it'll be worth it, I promise. So, will ya?"
Kyle broke into a smile. "Definitely. But Butters... Why are you doing this?"
It was perhaps the most evil smirk the others had ever seen from him. "I trust you remember... Professor Chaos?" he asked. There was a pause, before he was back to his normal self. "I better go see what AWESOM-O's up to, huh? Be right back."
As Butters disappeared into the kitchen, Stan noted, "Dude. Butters might be my hero."
"Totally," Kenny agreed.
(A/N: Watch the episode again pretending that Butters knows that it's Eric in the costume. It's a lot more hilarious.)