Works in Mongrel - Fails in Passenger

class FooController < ApplicationController
    after_filter 'run_some_magic'

    def run_some_magic
        StatsMagic.whoa('holy crap')
    end
end


class StatsMagic
    def self.initialize
        @@stats = ''
        Thread.new {
            while true {
                sleep 5
                p @@stats
            }
        }
    end

    def self.whoa(the_business)
        @@stats = the_business
    end
end