Odd behavior here.

gistfile1.txt

 ‹ruby-1.9.3@devel› $ irb                                                                                  
ruby-1.9.3-preview1 :001 > YAML
 => YAML 
ruby-1.9.3-preview1 :002 > YAML.method(:load)
 => #<Method: Module(Kernel)#load> 
ruby-1.9.3-preview1 :003 > YAML.load "--- hello world!"
NoMethodError: private method `load' called for YAML:Module
	from (irb):3
	from /Users/kaichen/.rvm/rubies/ruby-1.9.3-preview1/bin/irb:16:in `<main>'
ruby-1.9.3-preview1 :004 > require 'yaml'
 => true 
ruby-1.9.3-preview1 :005 > YAML.method(:load)
 => #<Method: Psych.load> 
ruby-1.9.3-preview1 :006 > YAML.method(:load).source_location
 => ["/Users/kaichen/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/psych.rb", 111] 
ruby-1.9.3-preview1 :007 > YAML.load "--- hello world!"
 => "hello world!"