The greatest and worst method evARR!!!

class String
    def random_caps
        letters = self.split("")
        letters.length.times do |n|
            letters[n] = letters[n].upcase if rand(4) == 0
        end
        letters.join("")
    end
end

created after total boredom.

discuss uses, etc.

private static final Random rand = new Random();
public static String randomCaps(String s) {
  StringBuilder b = new StringBuilder(s);
  for(int i=0; i<b.length(); i++)
    b.setCharAt(i, rand.nextBoolean()
      ? Character.toUpperCase(b.getCharAt(i))
      : Character.toLowerCase(b.getCharAt(i)));
  return b.toString();
}