d3.selection.prototype.record = function() {

  var self = this,
      tweeners = [];

  // Get tweeners on each element in the selection
  self.each(function(d,i){

    // using .count should work as long as it's called right after the transition is created?
    // can use .active if you wait for the "start" event
    var node = this,
        pending = this.__transition__[this.__transition__.count],
        ease = pending.ease;

    // Loop through the element's tweens
    d3.values(pending.tween._).forEach(function(tween){
      // Create a tweener with the tween function and the element's datum and index
      var tweener = tween.call(node,d,i).bind(node);

      // Function that calls the tweener with an eased time value
      tweeners.push(function(t){
        tweener(ease(t));
      });

    });

  });

  // Return a function that takes t between 0 and 1
  return function(t){

    // Interrupt any transitions on the selection
    self.interrupt();

    // Apply every tweener function with the provided value t
    tweeners.forEach(function(tweener){
      tweener(t);
    });

  };

}