WWII is canon in the cars universe right? Sarg car is a WWII era car and he served in the military canonically. We also know planes are sentient which means the plane that dropped the atomic bomb was alive. Was the atomic bomb alive? Will we ever know?
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The living vehicles seem to have organic components, so with the relatively simple process of on-the-spot construction, the bomb likely lacked sentience. The plane, however, was the single most dangerous individual alive for a few minutes.