gistfile1.txt

# If you like f'ing around with people using your code, you can do
def stupid(arg, newval, b)
  lvars    = eval("local_variables",b)
  relevant = lvars.find { |lvar| eval(lvar, b).equal?(arg) }
  Thread.current[:stupid] = newval
  relevant.each do |lvar| eval("#{lvar} = Thread.current[:stupid]", b) end
end

a = 1
stupid(a, 2, binding)
p a