This room is unfit for humans . I want another room , and I want a refund for tonight .   Perhaps if you would be kind enough to tell me the problem , sir .   In a word , cockroaches !   Oh , no , are they back ? I'll give you another room immediately , sir , and a refund for tonight .   Thank you . I'm glad that you don't believe that your guests are liars .   Sir , without happy guests , we are nothing . 