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There is a hidden message on the upper skybox texture in the V-22 osprey g-man sequence. It reads "HACK HACK HACK ALL DAY LONG. HACK HACK HACK WHILE I SING THIS SONG". This is a reference to the Adam Sandler song "The Beating Of A High School Janitor".
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Opening up the console anytime during gameplay and entering the word "haiku" will freeze the game and display a random haiku on the screen. The way it works is that it takes several random sentences and botches them together to form a unique haiku every time.
YouTube video [now deleted]:
https://www.youtube.com/watch?v=u3ikj1KNWZU#t=1m30s
The Cutting Room Floor article:
https://tcrf.net/Half-Life:_Opposing_Force/Haikus
https://www.youtube.com/watch?v=u3ikj1KNWZU#t=1m30s
The Cutting Room Floor article:
https://tcrf.net/Half-Life:_Opposing_Force/Haikus
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