In 1978, Ivan Stang of the Church of the Subgenius created this nifty documentary titled "Reproduction Cycle Among Unicellular Life Forms Under the Rocks of Mars." It's part of a fictional "Early Childhood Enrichment Series, Science for Elementary Schools" series.
Claymation has never been this good: Link [embedded YouTube clip, quite risque yet oh-so-funny. You've been warned ...]