From Kim and Kourtney's feud to Friends' squabbling Gellers and Rudi and Smithy's wrestle-off in Gavin & Stacey, we seem to love a sibling stand-off whether it's real or fictional.
Case in point: Love Island twins Jess and Eve's first row over scaffolder Callum made great TV.
Needless to say, some of the responses are golden.
In his original Facebook post, Christian wrote: "What's the worst thing you've done as a sibling? I once convinced my brothers that the lolly bag you get at the end of a party was for the people that weren't invited. When they would get home from a friend's birthday I would just take the bag and eat everything."
So simple, but oh-so-good.
Nicole Cooke created a Chuckie-style nightmare for her unsuspecting younger bros.
"I had a lot of dolls ranging from Barbie size to a couple that were about 3 feet tall," she wrote. "When my brothers went to sleep I would stand them around their beds so they were the first thing they saw when they woke up, apparently they're still quite traumatised about it."
Shudder.
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Another Facebook user, Susie Que, wrote: "I carved 'I hate Susan' into my dressing table so my brother would get the blame. To be fair though, he gave me petrol to drink and told me it was Coke when I was 5."
Loving your bluff, Susan.
Other respondents - like Debbie Dye - got extra creative.
"When I was a kid, a car pulled up at the end of our driveway one day to ask for directions," she wrote. "I'm one of seven kids, and we told our youngest sibling he was adopted & it was his real family coming to pick up him up. He ran screaming up the hallway and locked himself in Mum's room for hours. #Sorrynotsorry."
Wow, brutal.
Kylie Szerwinski, on the other hand, was on the receiving end of a sibling deception, writing: "My older brother and sister used to tell me that everyone takes their legs off when they go to bed at night time.
"I became so distraught at not being able to disconnect my legs from my body at bed time. I cried to my mum, she told me the truth and told me them they were a*rseholes."
Meanwhile, Mel Jefferies convinced her brother to "re-enact the ab exercise machine ad in front of my friends" - with results that were even better than she'd hoped.
"Mid-curl with his butt in the air he farted," wrote Mel. "It's still legendary today. But the worst is probably when I accidentally bounced him off the trampoline - head first onto a pile of sticks... It was an accident but he's convinced I tried to kill him. Hmm... starting to see why he lives overseas now."
Guys, keep them coming. This is the stuff of Internet dreams - and sibling nightmares.
Featured Image Credit: Credit: PA Images / Warner Bros