Yang utterly trashing the dorm in search of a bottle of shampoo in 'RWBY Reacts to RWBY Trailers, Part 2'. And just afterwards, Weiss's punishment towards an innocent Cardin.
...the sounds of screaming left terror in the hearts of men in all of Beacon and nearby houses for a week.
'Weiss Reacts to Yanderes'. Specifically, Velvet kidnapping Weiss, forcing her to read terrible smut featuring thinly-veiled expies of her and Weiss, and then Weiss getting rescued by Ruby, who proceeds to get into a cheek-pinching fight with Velvet over Weiss!
'Weiss Reactsto Elf's Badfic'. This is where the fic starts to pick up its reputation for being one of the most meta fanfics in the archive, to be exact.
During 'Blake and the Great Mecha Battle', an Atlesian Paladin piloted by Cinder attempts to intervene in a fight between Blake with Yang and Weiss with Ruby in Blake's recreations of the Gurren Lagann and the Nirvash. Cue Cinder's Oh Crap moment at realising that both of their mecha are taller and more powerful than hers, and then a casual punch from the Gurren disassembling the Paladin entirely.
Weiss: "I-I just haven't had t-time to grow out yet! L-Let go of me!"
'Wrath of the Valkyrie' is a fanfic about Nora pranking everyone in Beacon for various reasons, usually minor ones. The fic by itself is already a Crowning Moment of Funny, but Nora's reactions to it are even funnier:
Nora: (reacting to the idea of taking her beloved sweets) NO PYRRHA I WONT LET YOU TOUCH MY BABIES
Nora: Okay, this one has knee-breaking....BUT I'M NOT OBSESSED WITH REN ENOUGH
In an earlier chapter featuring the story 'Pyrrha(c) victory', Pyrrha's various reactions to the stuff in the story. Basically, by the end of it, she wants to, among other things, invoke Clothing Damage to catch Jaune's attention.
Highlights of the chapter include: Roman commenting on everything, Glynda being flustered by absolutely everybody and everything, Cinder and Ozpin taking advantage of it and the wholly confused Chieri just casually reading the eponymous diary.