YSK if you've seen something traumatic, playing Tetris for a couple of hours afterwards can drastically reduce the chance of it becoming a deeprooted memory and causing PTSD
  Damizel @   Damizel @lemm.ee       Posts 0Comments 14Joined 2 yr. ago 
 Damizel @   Damizel @lemm.ee     
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I would imagine crossword puzzles or anything similar in that nature could also apply.