You go back in time and tell [person] that [bad thing] will happen if they don't [do something]. As soon as they are convinced, you vanish, because in the new timeline, there was no need for you to go back in time.
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So I show them this thread and they’ll know I disappear the moment they’re convinced!
That *might* work. However, we should probably assume that any objects you brought back in time will vanish along with you. So you start showing them a print-out of this thread...but you and the print-out vanish before the person can finish reading.
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Perhaps you could win by writing on contemporary paper with a contemporary pencil. You'd just have to be careful not to do so in the presence of the person; otherwise, you would likely disappear halfway through writing.
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Hm wouldn’t my writing disappear too?
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