Hello how may I help you? I need help building something Great! how can I help? I need to build a time machine You and I both know that is not possible. Are you certain If it were possible to build a time machine, you wouldn't be asking me because you would already have a time machine. Well then how can I go back and buy a bag of pretzels instead of these tortilla chips? Just exchange them. Say they are stale. I just saved you a ton of time and money. Ok thanks You're welcome.