(function(){
  'use strict';

  // from Prototype.js
  function getArgumentNames(func){
    var names = this.toString().match(/^[\s\(]*function[^(]*\(([^)]*)\)/)[1]
      .replace(/\/\/.*?[\r\n]|\/\*(?:.|[\r\n])*?\*\//g, '')
      .replace(/\s+/g, '').split(',');
    return names.length === 1 && !names[0] ? [] : names;
  }

  var key = 't';
  var mysteriousFunction = function(callback){
    return function(){
      // ident of first-arg or 't'
      key = getArgumentNames(callback)[0] || 't';
      callback(Date.now);

      // only once
      mysteriousFunction = function(){
        throw "ERROR: This code runs in your single universe.";
      };
    };
  };

  function generateMysteriousObject(){
    var functors = [];
    var mValue;

    var mysteriousObject;
    (mysteriousObject = {
      compute:function(functor) {
        return [].push.bind(functors,functor);
      },
      appear:function(value) {
        return function()  {
            mValue = value;
            functors.map( function(functor){ functor(value); } );
        };
      }
    })[key] = function(){
      return mValue;
    };

    return mysteriousObject;
  }

  var wtf = function(callback)  {
    switch( typeof callback ){
    case "function": return mysteriousFunction(callback);
    default:         return generateMysteriousObject();
  };

  Object.defineProperties(wtf, {
    world: {
      set: function(functor) { functor(); }
    }
  });

  wtf.log = function()  {
    return console.info.bind(console, arguments);
  };

  var root = this;
  if (typeof module !== 'undefined' && module.exports) {
    module.exports = wtf;
  } else {
    root.___ = wtf;
  }

})();