Pretty neat! The only thing I have doubts about is that not too many people get scared about too many things in this day and age of visual FX and the dismissal of legends in the name of what's real and what we can see and feel. Not to mention what we get up to every day when we turn on the news!
However, for those who were truly scared by this joke, it shows that no matter how much we dismiss legends and religion for cold hard fact, there are some who still have that primal fear in the back of their minds. We're only human after all