I'm not satisfied with it .   Why not ? What's wrong with it ?   Sometimes it goes fast . And sometimes it goes slow . And the alarm doesn'twork , either .   Would you like another one ?   No . Can I have my money back ?   Hmm ... have you got a receipt ?   A receipt ?   Yes . I must see your receipt . You can't have your money back without receipt .   Oh , I'm not certain , but I think I've lost it . 