It was a legitimate question. The following are funny, legitimate differences between en-uk/en-us and to my knowledge did not represent any change in semantic value:

  'colour'       => 'color',
  'centre'       => 'center',
  'capitalise'   => 'capitalize'
  'grey'         => 'gray',   # less definitive than others

Why does being curious about en-uk/en-us language differences lead you to believe that I do not have a sense of humor?