SOMEBODY ESPLAIN!

Customer: I have a Magellan GPS and I was wondering how to update it?
Me: Just go to Magellan's website and download the maps.
Customer: It's a Tom Tom.
Me: Then go to Tom Tom's website.
Customer: How are the Tom Tom's rated?
Me: Well, Garmin's are higher rated.
Customer: That's what I have, a Garmin.
Me: ???