Magical Java Puzzle: “Pat The Unicorns” http://zeroturnaround.com/fun/magical-java-puzzle-pat-the-unicorns/

MagicalLand.java

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");
	}
	public static class Unicorn {
		private static int i = 0;
		public static boolean pat() {
			try {
				throw new Exception();
			} catch(Exception e) {
				for(StackTraceElement l: e.getStackTrace()) {
					if(l.getMethodName() == "main") {
						switch(l.getLineNumber()) {
						case 4:
							if(i == 0) {
								i++;
								return true;
							}
							break;
						case 9:
							if(i == 1) {
								i++;
								return true;
							}
							break;
						}
					}
				}
			}
			return false;
		}
	}
}