When you're a kid, any loud noise can count as a jump scare, and wow, do the Harry Potter movies offer plenty of jump scares for kids that made you...FLINCH!
Here's my ranking of what I found to be the most "flinch-worthy" jump scares from the eight Harry Potter movies:
*Note* I am basing this list off when I was a kid, seeing these films for the first time. My memory isn't fantastic, so please comment any jump scares I might have missed or just don't remember that made you jump as a kid.
15.Helena Ravenclaw yelling (Deathly Hallows Part II)