From recent frustrations a co-worker had with nil and division of zero in Ruby comes the fu-nil gem. Not pronounced foo but rather Eff You as a giant middle finger to the Ruby nil and not being allowed to be used in math operators. The division by zero is an added luxury to the fu-nil gem.
gem install fu_nil
irb
require 'rubygems'
require 'fu_nil'
5 + nil + 3 # 8
100.0 / 0 # 0
100 / nil # 0