Muggleborn kid with a talent for magic. Not real magic. Like, sleight of hand magic. And then a prefect catches them doing something like making a ball appear to vanish or whatever, and just loses their shit because this 11 year old kid has utterly mastered Vanishing Spells and what the hell how is that even possible.
Occasionally Hufflepuffs get caught trying to sneak into another common room because they’re so curious about what it looks like and how the other houses do things differently.
hufflepuff/slytherin friendships are the best and most terrifying thing ever because i am positive that if 2 people were two take over the world it would be a slytherin and a hufflepuff