This is one my dad told me about. He was in the Marines from 60 to 63. When he was coming back to the states he boarded a ship and there were not enough bunks in the Marines section so he had to bunk the 5th he Navy people. When he dumped his sea bag on the bunk 2 complete blue practice grenades rolled out. Someone asked if they were real grenades and replied "sure, have one." he then pulled the pin on one and tossed it on the sailor's bunk. He claimed that he had never seen them move faster getting out of there.

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