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Back To The Future 2 Revisited (time travel causes brain damage)

2014-04-28 3 Dailymotion

In Back To The Future 2 , before the first return to 1985 , Doc warns to "brace yourself for temporal displacement" This got me wondering , firstly : why Doc never gave this warning before any other time jumps , and , more so , what exactly is : "temporal displacement" ,and , what does it feel like?
Here i hoped to capture the essence of "temporal displacement"