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M.C. Safety and the Caution Crew is a song that appeared in the episode Bart vs. Lisa vs. the Third Grade.
Yo Yo Yo Yo,
I'm feelin' cautious.
I say a crosswalk a crossity walk, and you don't stop crossing till you're on the next block.
First you look both ways, and you walk not run;
Obeying safety rules is acceptable fun.
Break it down now!
Walk don't run;