Pick a point on your computer monitor, maybe the period at the end of this paragraph, and stare at it. Now wiggle your head around a bit, bounce up and down in your seat, or even try balancing on one foot while still staring at that point. What you'll find is your eyes and your brain start communicating and working together so that you can keep pretty good focus on that point - the human body really is an intelligent thing. Video cameras however, are pretty dumb in comparison. Luckily you can "smarten" them up with the use of a simple tripod.