Self-destruction lever with a timer and alarm.

var detonator = function (count) {
  return function () {
    if (count > 0) {
      console.log(count + "...");
      count--;
      setTimeout(detonator(count), 1000);
    } else {
      console.log("BOOM!");
    }
  };
};
var bomb = detonator(3);
bomb();