Jones' father was wounded by a gunshot, and he can only be saved by drinking the Holy Grail. However, only one of the more than a dozen holy grails is true, and he died immediately after drinking the water from the fake holy grail. Jones yelled, "There is only one way to confirm," while taking a sip from a wooden cup, he quickly gave his father a drink after discovering that he was not dead and healed his gunshot wound. But the obvious more reasonable choice is to drink it directly to the father. If it is true, then it will be cured, and the fake will burp, at least the son will survive. The son drinks first. If the true Holy Grail is true, both will live. If the fake one is eaten, both of them will burp and lose one.
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