Vita and her ice-cream first experience. It's... Freudian. It goes way over the top when Usagi decides to weaponize it.
Haruna putting an end to the ruckus during Magical Girls' meeting.
Haruna got the resulting rumble back out of control by simple Magnificent Bastardry. "Imperium Graphices! Summon Overfiend, Great Paru-sama Edition!" There was much screaming and order was restored. Haruna, apparently, put much less emphasis on 'Magnificent.'
Negi is mistaken as a girl. It goes downhill for him from there. More and more people apologize for 'mistaking him' for a boy and his students replace his clothes with feminine versions.
A meta-example is the author's tangent about Purple Prose at the end of Chapter 13.
The Man of Steel is forced to admit that he was KO'd by a 'little girl with a magic croquet mallet'. Batman travels all the way to Metropolis to taunt him in person.
In the second book, Nanoha and The Flash travel to Antarctica to destroy the White Martian terraforming tower there. While there, Nanoha uses the opportunity to take a few pictures with the local fauna, and send them to her friends:
Alisa: SHE DITCHED US TO TAKE PENGUIN SELFIES?! THAT BITCH! SHE COULD'VE TAKEN US ALONG!! Suzuka: This is so selfish! I've always wanted to see a penguin!