Well it can use some work but I really liked it!
There's something about these really short test videos that makes it really satisfying to watch.
I have a walk cycle animation video that's about four seconds and somehow it got a bunch of views. Odd!
Any way, the sound and the effect were synced nicely. However, I think the visual effect itself can be done a bit better, perhaps with better stock footage and with a different blending mode.
Keep experimenting with your tools, I can't wait to see some of those skits!