comment: >
  
  Urine is filtered from the blood, a.k.a. the stuff your blood does not want.
context: This is a friendly reminder to read our rules.
  Remember, /r/Showerthoughts is for showerthoughts, not "thoughts had in the shower!"
  (For an explanation of what a "showerthought" is, please read this page.)
  Rule-breaking posts may result in bans. >
  
  
  Blood creates urine
  
  Are we just going to ignore the kidneys here? >
  
  They meant that urine is created from blood filtered by kidneys.
  So, technically, you urinate blood. Just not all of it.