gistfile1.rb

irb(main):010:0> t = Class.new
=> #<Class:0x0000080cb48f48>
irb(main):011:0> t.instance_variables
=> []
irb(main):012:0> t.instance_eval { @pants = 'onyourhead' }
=> "onyourhead"
irb(main):013:0> t.instance_variables
=> [:@pants]
irb(main):014:0> t.instance_variable_get(:@pants)
=> "onyourhead"