A scene from approximately the third or fourth story arc of "Kim Possible: STD"
The hallway was mostly deserted as Kim and Ron entered Middleton High, Ron following in her wake through a double door located near the gym. But as their guest trailed along behind them, a distinctly unwelcome voice showed that they weren't entirely alone.
"I can't wait to hear you explain this one, Kim."
Kim glanced over at Bonnie, who was lounging against her locker while hanging out with Tara and Amber in the hallway before classes began. "Explain what?" she asked.
Bonnie pointed with a jerk of her chin to Kim's cousin Joss, her lips creasing into a wicked smile as she took in the face and hairstyle that looked so much like Kim's, above clothing identical to Ron's - an oversized red jersey over a black turtleneck and cargo pants. "Stoppable's and your daughter there. She's much too old for it to have been normal - like anything involving you or Ron could ever be normal. So how'd it happen? Is she a visitor from a parallel dimension? Another weird cloning mishap? Mutagenic ooze? Time travel? Age-ray?"
"Sounds like someone's been reading the website," Joss mock- whispered to Ron with a giggle, deliberately loud enough for Bonnie to overhear and flush - either in anger or embarrassment.
"Coolio, Bon-bon... What's your screen name in the chat room? Anything I'd recognize?" Ron grinned. "One of the Ron-man's many fans?"
Bonnie favored Ron with a withering glare, which rolled over him without impact. He simply smiled and waited for her answer - which was not forthcoming.
"She's not my daughter, Bonnie," Kim explained, shaking her head at Joss and Ron's antics as they tweaked her rival.
"I'm not Ron's daughter either," Joss chimed in. "Heck, if I was his daughter, I reckon my drawers would have dropped by now."
Like magic, Ron's pants chose that moment to drop to the floor, followed a heartbeat later by Joss's own. Revealed by the possibly accidental incident were his red boxer shorts with white spots, and her complimentary white boxer shorts with red spots.
"Boy, howdy," Joss commented, pulling her pants back up with a smirk even as Ron fixed his own. "Would you lookee there. You'd almost think we were related or somethin'."
Bonnie snorted in disgust and stomped away, irked that her needling of Kim had been turned on her.
"Boo-yah!" Ron high-fived Kim's cousin as they chortled together. "Nice one," he praised, as he flashed a thumbs-up sign. "Like I said - smart as a whip."
Tara and Amber were both wide-eyed as they looked back and forth between Kim, Ron, and Joss. "You mean she really is your daughter?" Tara asked hesitantly.
"No, Tara. She's my cousin. She just... idolizes Ron," Kim explained, rolling her eyes as Rufus scampered up through Ron's clothes, down his arm, then jumped from Ron's hand to Joss'.
Blushing, Tara shrugged. "I didn't really think she could be, but the way things happen around you - and especially Ron..." she trailed off.
"It's no big," Kim answered easily, still frowning at Ron and Joss as Rufus took the opportunity to cheer and congratulate the girl in turn from his new perch on Joss' shoulder.
"Stoppable! Possible!" Mr. Barkin's raised voice echoed through the hall. He marched towards them, then abruptly came to a stop as he noticed the other Possible in their midst. He eyeballed them for a long minute, his brow furrowing deeper and deeper as time passed. Finally, he spoke. "Daughter, clone, or time traveller?" he demanded.
"See?" Kim rolled her eyes as Tara giggled.