The Thousand Yard Stare is the emotionless and somewhat unsettling stare of WW1 soldiers after living their lives in the trenches and under a roof of arcing artillery, constantly barraging the enemy. It started in WW1, but the term spread throughout the upcoming wars, especially Vietnam.
Look it up, my phone won't let me upload pictures right now idk why.
[spoiler]Just a caution some are actually really unsettling[/spoiler]
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It's also the way I look when I lay in bed at night, staring at the ceiling. Afraid to fall asleep to nightmares of the 1000yard trials sweatys.