>> def awesome
>> x = 7
>> proc { self * x }
>> end
=> nil
>> awesome
=> #<Proc:0x00368b84@(irb):3>
>> awesome[]
NoMethodError: undefined method `*' for main:Object
	from (irb):3:in `awesome'
	from (irb):6:in `[]'
	from (irb):6
	from :0
>> 12.instance_eval(&awesome)
=> 84