[okay, you can DO THIS, Madoka. if it weren't for the wind and the sound waves, this guy would just be your run-of-the-mill prankster. right? right.]

[so, after reassuring herself that she has nothing to fear, because there's nothing more at play here than science, she dips forward in an apologetic bow.]

Um ... You've been playing a really good joke on me! I'm really sorry if my reaction was rude at all — you're easily the best at pranking compared to anybody else I've met.

[the ghost has literally been dumbfounded into inaction, because if anybody should be apologizing here, it's him. Madoka ... Madoka wins??]