I remember visiting this website once...
It was called Muggleborn Problems
Here's some stuff I remembered seeing:
A blog full of headcanons about muggleborns! Feel free to send us some! Ask box: Open
2094. Muggleborns showing up late to class and telling the professor a wizard is never late. Nor is he early. He arrives precisely when he means to.
Congratulations to the winners of the March House Cup, Hufflepuff House! For the month of April, the blog will be themed after your house colors.
The April House Cup opens today, so be sure to keep liking, reblogging, and submitting headcanons for your house. Good luck!
2093. Muggleborns enchanting their band posters to sing the music to them whenever they want.
2092. Muggleborns who like chemistry find they’re amazing at Potions.
2091. The first conversation about magic blood a muggleborn has with a pureblood going like this:
“So what’s your blood?” And the muggleborn just looking a little bit freaked out because is this custom in the magic world?
2090. a first year Muggleborn with a stutter learning how to do nonverbal spells so she doesn’t have to speak during duels or classes and such.
2089. As an Easter prank, the older muggleborns throw an egg hunt. Charmed to be portkeys, the eggs transport the younger students and fascinated pure-bloods right into the Great Lake when touched.
2088. No one realizes that the objects in the Room of Requirement come from somewhere else, until it starts producing DVDs of popular muggleborn movies and shows. Muggleborns start taking them and making stashes under their beds of all of their favorites, and a few days later the news reports on significant portions of Amazon’s inventory going missing.
2087. Muggleborns petition the Ministry of Magic to start a space program. It works and now witches and wizards are apparating across the Milky Way.
2086. when muggleborns get angry at their pureblood roommates they turn up their “muggle” music (to be extra obnoxious heavy rap or metal) as loud as they can to get them out of the room.