Here's a section of one of my first math videos before I started using green screens. I drove all over the San Diego area for the biker shots and when I previewed the clips the audio was really bad so I had to do voice overs to fix them. I did all of the video work myself on the sides of the road with people driving by and beeping their horns. I had people walk up to me in the middle of saying my lines and asking, "What are you filming"? But aside from all of that it was fun. At least I got to ride my motorcycle.
http://youtube.com/watch?v=VlqhVldVces