irb(main):001:1* class String
irb(main):002:2*   def==(other)
irb(main):003:2*     return true if other.is_a?(FalseClass) && self == ''
irb(main):004:2*
irb(main):005:2*     super
irb(main):006:1*   end
irb(main):007:0> end
=> :==
irb(main):008:0> '' == false
=> true

<hack hack hack>

puts "this string should not be printed" if ""

irb(main):009:1* class String
irb(main):010:2*   def true?
irb(main):011:2*     self == '' || super
irb(main):012:1*   end
irb(main):013:0> end
=> :true?
irb(main):014:0> p 'true' if ''
"true"
=> "true"
irb(main):015:0>