I like the concept. The idea of the vampire's riddle first being subverted into cuteness and standup, then back into scariness is cool. Maybe some voice effects on that last line would have made it more dramatic. At least a more dramatic pronunciation would have also worked. Though I guess it kinda works with the character and his voice. Something about that stock scream doesn't add the necessary drama either. The pronunciation of "Hi, I have a riddle!" sounded kinda weird, especially considering it's supposed to be a stand-up show. The background music was a cool touch, and I liked how simple and obvious the riddle was.

Overall, it could be better in terms of punchline, but it had an interesting set-up.