This is sick...

gistfile1.rb

--- ~ » irb
2.0.0p247 :001 > class MyClass
2.0.0p247 :002?>   def initialize(val)
2.0.0p247 :003?>     @x = val
2.0.0p247 :004?>     end
2.0.0p247 :005?>   def my_method
2.0.0p247 :006?>     @x
2.0.0p247 :007?>     end
2.0.0p247 :008?>   end
 => nil
2.0.0p247 :009 > obj1 = MyClass.new(1)
 => #<MyClass:0x007fc09a096160 @x=1>
2.0.0p247 :010 > obj2 = MyClass.new(2)
 => #<MyClass:0x007fc09a07ec18 @x=2>
2.0.0p247 :011 > m = obj1.method :my_method
 => #<Method: MyClass#my_method>
2.0.0p247 :012 > m.call
 => 1
2.0.0p247 :013 > m2 = m.unbind.bind(obj2)
 => #<Method: MyClass#my_method>
2.0.0p247 :014 > m2.call
 => 2
2.0.0p247 :015 >