Requring psych before yaml, ruby-1.9.2-p180 on centos

gistfile1.sh

ruby-1.9.2-p180 :006 > exit
[clients-user@ip-10-83-118-38 workspace]$ cd ..
[clients-user@ip-10-83-118-38 workspace]$ vi config
config/    config.ru  
[clients-user@ip-10-83-118-38 workspace]$ vi config/
application.rb        cucumber.yml          database.yml.example  environments/         locales/              
boot.rb               database.yml          environment.rb        initializers/         routes.rb             
[clients-user@ip-10-83-118-38 workspace]$ vi config/database.yml.example 
[clients-user@ip-10-83-118-38 workspace]$ irb
ruby-1.9.2-p180 :001 > require 'pp'
 => true 
ruby-1.9.2-p180 :002 > require 'psych'
 => true 
ruby-1.9.2-p180 :003 > require 'yaml'
 => true 
ruby-1.9.2-p180 :004 > pp YAML.load_file('config/database.yml.example')
{"common"=>
  {"adapter"=>"postgresql",
   "username"=>"postgres",
   "password"=>"password",
   "host"=>"localhost"},
 "development"=>
  {"adapter"=>"postgresql",
   "username"=>"postgres",
   "password"=>"password",
   "host"=>"localhost"}}
 => {"common"=>{"adapter"=>"postgresql", "username"=>"postgres", "password"=>"password", "host"=>"localhost"}, "development"=>{"adapter"=>"postgresql", "username"=>"postgres", "password"=>"password", "host"=>"localhost"}} 
ruby-1.9.2-p180 :005 > exit
[clients-user@ip-10-83-118-38 workspace]$ irb
ruby-1.9.2-p180 :001 > require 'pp'
 => true 
ruby-1.9.2-p180 :002 > require 'yaml'
 => true 
ruby-1.9.2-p180 :003 > require 'psych'
 => true 
ruby-1.9.2-p180 :004 > pp YAML.load_file('config/database.yml.example')
{"common"=>
  {"adapter"=>"postgresql",
   "username"=>"postgres",
   "password"=>"password",
   "host"=>"localhost"},
 "development"=>
  {"adapter"=>"postgresql",
   "username"=>"postgres",
   "password"=>"password",
   "host"=>"localhost",
   "database"=>"foo_dev"}}
 => {"common"=>{"adapter"=>"postgresql", "username"=>"postgres", "password"=>"password", "host"=>"localhost"}, "development"=>{"adapter"=>"postgresql", "username"=>"postgres", "password"=>"password", "host"=>"localhost", "database"=>"foo_dev"}} 

the database key gets overwritten. something broke yaml.