Object#method

gistfile1.rb

ree-1.8.7-2010.02 > some_string = "hi there"
 => "hi there"
 ree-1.8.7-2010.02 > some_string.capitalize
 => "Hi there"
ree-1.8.7-2010.02 > some_method = some_string.method :capitalize
 => #<Method: String#capitalize>
ree-1.8.7-2010.02 > some_method.call
 => "Hi there"
ree-1.8.7-2010.02 > String.class_eval { remove_method(:capitalize) }
 => String
ree-1.8.7-2010.02 > some_string.capitalize
NoMethodError: undefined method `capitalize' for "hi there":String
        from (irb):18
ree-1.8.7-2010.02 > some_method.call
 => "Hi there"

ree-1.8.7-2010.02 > unbound = some_method.unbind
 => #<UnboundMethod: String#capitalize>
ree-1.8.7-2010.02 > unbound.call
NoMethodError: undefined method `call' for #<UnboundMethod: String#capitalize>
        from (irb):23
ree-1.8.7-2010.02 > another_string = "bye bye"
 => "bye bye"
ree-1.8.7-2010.02 > another_string.capitalize
NoMethodError: undefined method `capitalize' for "bye bye":String
        from (irb):26
ree-1.8.7-2010.02 > rebound = unbound.bind(another_string)
 => #<Method: String#capitalize>
ree-1.8.7-2010.02 > rebound.call
 => "Bye bye"