Before Charles Martinet, these clips were used as placeholders until they got the real thing. No one knows who made them yet so far, but I'm pretty sure Nintendo will leak who did it sooner or later. I don't know why they sound so weird, but then again, they didn't have to make it realistic, since they are just placeholders. Sound effect from Youtube video by 4zy1 Thumbnail by something from downloads.khinsider.com