The roll over effect comes from the Spell Phone feature associated with Trollz, the animated property based on the classic troll dolls with tall colorful hair. On Trollz.com the Spell Phone worked as an interactive magical phone, with separate sounds for actions like hovering and selecting. Short interface sounds like this were saved and shared on soundboards because they are clean, recognizable and easy to reuse. It remains in use as a generic cute hover effect, even for projects unrelated to Trollz, thanks to its brief sparkly tone.