Planet Earth was fantastic. High on its own graphics, with some weird bits that were interesting. I vaguely remember a bird comically flopping/falling around some cliff area, and everyone laughing in class.

Also, it means no class work or lecture, and it's not a bad pre-teen movie like High School Musical, one of my old Math teacher's favorite options. Or retelling a middle school/high-school class what the three states of matter are. Planet Earth made some of the best Biology class days.