I just use windows movie maker as it's easy to use. There are other programs but I tend to find they over complicate things, movie is fairly easy to just plonk the wmv file in, trim it, and overlay with the url and then save it.
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Actually I was dicking around with the webcam the other morning at around 6am and looking at some of the effects and shit on it and made this...
Which actually just reminded me that I have some awesome Elisha Cuthbert gifs for The
Chump.