[Redster]

  a haiku once writ  
  needs validation surely  
  validator's broke  

  Line 1 - 5 / 5  
  a(1) haiku(2) once(1) writ(1)  
  Line 2 - 8 / 7  
  needs(1) validation(4) surely(3)  
  Line 3 - 6 / 5  
  validator's(4) broke(2)

[riffraff]

isn't surely 2 sillables? That's how the "Don't call me Shirley" joke works in "Airplane!"

[Redster]

Correct. And broke is also one syllable. Hence "validator's broke".