CrabDude

  trycatch(function(){
    process.nextTick(function() {
      throw new Error("This will be caught.");
    });
  }, function(e) {
    console.log(e.stack);
  });

  var step = require('step');
  
  function huntMen(buffy) {
    var soulmates = [];
    
    step(function() {
      var group = this.group();
     
      while (soulmates.length < 10) {
        // Self-executing for closure
        (function() {
          var cb = group();
          step(function() {
            // Get 10 candidates for Buffy  
            getMatches(buffy, 10, this);
          }, function(err, userids) {
            // don't check userids.length on each loop iteration
            for (var i = 0, l = userids.length; u = userids[i], i < l; i++) {
              // Self-executing for closure, or use userids.forEach
              (function() {
                step(function() {
                  // get their pic from our pic server
                  getThumbnail  (u, this);
                }, function(err, thumb) {
                  thumb2 = thumb;
                  // ask our pic analyzer to review
                  isPicAVampire(thumb, this);
                }, function (err, is_vamp) {
                  if (! is_vamp) {
                    // get 2 more pieces of info
                    getPersonality(u, this.parallel());
                    getLastTalked (u, match, this.parallel());
                  } else cb();
                }, function (err, personality, last_talked) {
                  soulmates.push({
                    "userid" : match, // match does not exist in example code
                    "thumb"  : thumb2,
                    "last_talked" : last_talked,
                    "personality" : personality
                  });
                  cb();
                });
              })();
            }
          });
        })();
      }
    }, function(err) {
      //
      // Our function can now continue to do
      // whatever it wants with
      // soulmates...
      //
    });
  }

  function User(first, last) {
    if ( !(this instanceof User) ) 
      return new User(first, last);

    // constructor logic
  }

  function User(first, last) {
    if ( !(this instanceof arguments.callee) ) 
      return new arguments.callee(arguments[0],...);

    // constructor logic
  }