You Can't Change the Past!
Storyline: A scientist creates a time machine just to prove that it can be done, but never plans to use it, since he knows that it would be too dangerous to attempt to alter the past. His assistant, however, is envious of the fame such a journey would bring and so clouts the scientist on the jaw and takes off in the machine, only to find himself stuck in the past rendered insubstantial by fate like a ghost unable to affect anything.
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