They got a lot of funny looks from their friends.

Fregley had always been a bit of an enigma. His quirky habits and unconventional behavior made him stand out, even among the eclectic mix of characters at Greg Heffley's school. So when Greg invited Fregley over for a sleepover, he knew it was going to be an interesting night. He just didn’t know how interesting it would turn out to be. The Heffley household was quiet as everyone was finally asleep. Everyone except for Fregley, that is. Fregley had something mischievous in mind, something that he found both exciting and hilarious — he was going to swap undies with Rodrick, Greg’s older brother. Why? Even Fregley couldn't quite explain. It just seemed like a fun idea. Carefully, he tiptoed into Rodrick’s room where the teenage wannabe rockstar was snoring away, oblivious to the world. Fregley had brought a flashlight and shone it around until he found Rodrick's laundry basket. Swiftly, he swapped his own tighty-whities for Rodrick's boxers covered with grunge band logos. The next morning, Fregley woke up with a grin that stretched from ear to ear. He wiggled in excitement, feeling strangely powerful in Rodrick's boxers. He quickly dressed and waited for the inevitable chaos to unfold. Rodrick, on the other hand, was in for a shock. Groggily, he reached for his clothes and slipped into what he thought were his usual boxers. As the fabric made contact with his skin, he felt something was off. He looked down to see himself wearing a pair of bright white, nerdy-as-you-can-get tighty-whities. "What the heck?!" Rodrick exclaimed, loud enough to wake up half the house. But there was no time to solve the underwear mystery — Mom was yelling that they were running late for school. With Greg rolling his eyes at the morning ruckus and Rodrick still fuming and confused, the three of them rushed out the door. At school, Greg noticed Fregley’s odd behavior more than usual — he seemed unusually triumphant and kept dropping bizarre hints about underwear. As for Rodrick, the high school student dreadfully realized he’d have to go through the whole day not just in Fregley’s nerdy tighty-whities but also with the growing suspicion that Fregley had something to do with it. The day went on, filled with awkward shifts in sitting positions for Rodrick and an unusually confident Fregley. Fregley's excitement didn't wane; he felt like he was carrying a piece of Rodrick's rebellious spirit with him. By the end of the day, even Greg had figured out something was up. Later that evening, back at the Heffley house, Rodrick finally cornered Fregley and demanded an explanation. Fregley, with his usual unsettling smile, admitted to the underwear switch, thinking Rodrick would find it as funny as he did. He was wrong. Rodrick was livid at first, but then, seeing the genuine joy on Fregley’s face, he couldn’t help but laugh a little. "You’re nuts, you know that?" Rodrick said, shaking his head. Fregley beamed, taking it as a compliment. Returning the underwear and swapping back, both realized that while the experience was bizarre, it made for an unforgettable story. Rodrick made it clear: "Never again, dude. Never. Again." Fregley, still with his weird sense of humor, simply nodded, his mischievous grin never fading. Greg, observing all this, sighed. Another day in the life of a Wimpy Kid.

Once upon a time, within the suburban landscape where Greg Heffley and his older brother Rodrick lived, arrived an eccentric character named Fregley. He was a strange neighborhood kid, the sort of friend Greg's mother would insist him on making friends with. On one uncommonly peculiar weekend, Fregley was invited over for a sleepover at Greg's place, a gathering that Greg with all power tried to avoid, but alas, his mother convinced him otherwise. Greg's older brother, Rodrick, a notorious prankster, had no idea what was to come. After an evening of video games, comic books, and a whole load of popcorn, everyone eventually drifted to a deep sleep except for mischievous Fregley. An idea flickered in his mind. He decided to pull a prank on Rodrick, something unprecedented and imaginably hilarious in its own way. With stealth of a cat, Fregley sneaked into Rodrick's room and swapped their underwear. The thought of wearing Rodrick's underwear excited Fregley immensely, as if he was going to acquire some sort of superpowers or at least become a bit cooler. Morning dawned, and in the usual chaos of the Heffley household, both Rodrick and Fregley, in a hurry, didn't notice the switch. Fregley slipped on Rodrick's rebellious-looking black undies, grinning from ear to ear, while Rodrick found himself puzzled by the rather nerdy underpants he stumbled upon. In the flurry of getting ready and catching the bus on time, they both decided to carry on. The day at school was a rollicking rollercoaster ride. Rodrick, always known for his devil-may-care attitude, felt surprisingly conscious about the unusual under garment, and even a bit nerdy, while Fregley found himself strutting down school hallways as if he was the rocker himself, thanks to Rodrick's "cooler" undies. Word of this incident spread like wildfire when Fregley, in all his excitement, spilled the beans at lunch, making Rodrick the laughing stock and Fregley the unexpected hero of the day. Everyone chuckled at how the tables had turned for a day, all thanks to a prank by Fregley, forever remembered as the great underwear switch. To their relief, no more such pranks followed in the future sleepovers at the Heffley's, but the incident served as a reminder to Rodrick - that he too could fall prey to an amusing prank, and for Fregley, it was his moment in the sun, where he undeniably had the last laugh.