MagicalLand

public class MagicalLand {

  
  public static void main(String[] args) {
    for (int i = 0; i < (Math.random() * 500) + 2; i++) {
      if (Unicorn.pat()) {
        System.out.println("UNICORN #1: PAT THIS UNICORN ONCE");
      }
    }
 
    for (int i = 0; i < (Math.random() * 500) + 2; i++) {
      if (Unicorn.pat()) {
        System.out.println("UNICORN #2: PAT THIS UNICORN ONCE");
      }
    }
    System.out.println("END OF PROGRAM");
  }
  
  private static class Unicorn {

    private static final ThreadLocal<Integer> line = new ThreadLocal<Integer>();
    
    public static boolean pat() {
      
      StackTraceElement elements[] = Thread.currentThread().getStackTrace();
      
      if ( elements != null ) {
        for ( StackTraceElement e : elements ) {
          if(e.getClassName().endsWith("MagicalLand") && 
              (line.get() == null || line.get() != e.getLineNumber())) {
                line.set(e.getLineNumber());
                return true;          
          }
        }
      }
      return false;       
    }
  }
}