Even though your lines usually tend to be funny or even witty, I believe that you should either add more frames or somehow change the motions. You reuse everything in every single one of your animations (the same dude, the same movements, the same scene) and just change the lines and add one minor change: Shaggy's face, the text here... It seems a little lazy and it becomes repetitive.
You didn't do that, for example, when you tried to explain 4chan, which was a rather nice change. It'd be nice if you did that more often (although I understand that it would imply more work and maybe hinder your pace of production). Just my two cents.