If you want someone to calm down, you might say “Cool your jets!” This expression is among several catchphrases from a 1950s TV show about the extraterrestrial adventures of Tom Corbett, Space Cadet. Others include plug your jets, meaning to shut up; cut your jets, meaning to quit doing something; blow your jets, which meant to get angry. The TV series was apparently inspired by by the Robert Heinlein novel Space Cadet, which also led to space cadet as an ironic term for someone whose head is metaphorically in the clouds. This is part of a complete episode.
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