gistfile1.txt

#!/usr/bin/env ruby

class HasMethods
  def method1
    return 3
  end

  def method2
    return 7
  end
end

one = HasMethods.new
two = HasMethods.new

puts one.method1
puts two.method1
puts one.method2
puts two.method2

class << two
  undef_method :method2
end

puts '-'*25

puts one.method1
puts two.method1
puts one.method2
puts two.method2