Very Witty
This was a very intelligently executed joke. At first I was sure it was going to be something serious - he made a deal with the devil and must make some macabre decision about life and death or such - perhaps with some sort of silly/sick twist at the end, however...
The punchline was completely surprising, and the concluding dialogue, done in such a matter-of-fact way was very entertaining. The length was great, the animation style was also very fitting. The voice acting was on point, though it was a bit difficult to understand in some areas.
Overall, a very clever and well put together flash movie.