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Flashback(s) or Flash Back may refer to:
Flashback (narrative), in literature and drama, a scene that takes the narrative back in time
Flashback (psychology), in which a memory is suddenly and unexpectedly revisited
Acid flashback, a reported psychological effect of LSD use
Flashback (welding), a hazard of using an oxyacetylene torch
Flashback arrestor, a safety device used in oxy-fuel welding and cutting