Disclaimer: I don't own GI Joe, which is owned by Hasbro. Only the plot is mine and I make no profit from this.
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Contrary to popular belief, shooting stars actually had no power. A wish made on one was harmless and very unlikely to be fulfilled. Though to be careful, the team did still keep a lookout just in case. There were belief-made items after all, so it wasn't unbelievable that a strong enough wish on a shooting star could cause something.