"Rattlers in your stomach" was an Earth saying used when asking someone if they were nervous.

Jack Crichton asked his son, John, if he had rattlers in his stomach before John's test flight aboard Farscape-1.

Later, after John's encounter with the wormhole and various aliens, he recorded a message for his father admitting, "Dad you know those rattlers in the stomach we talked about? Well I got 'em now...." ("Premiere")

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