Sister Mary Elephant originated as a Cheech and Chong comedy album sketch in the early 1970s, built around a substitute teacher facing an unruly class on the first day back. The routine became one of the duo's signature bits, quoted from its escalating pleas for quiet and its deadpan classroom exchanges. Radio play and shared recordings kept it in circulation for decades, and clips later spread on video and soundboard sites, where the final outburst is now isolated as a reaction to noise and disorder.