Whenever you are out and you are a customer somewhere whether it be at a counter or in a drive thru...
GET OFF YOUR PHONE!!!!
You have no idea how frustrating it is to deal with you and try and get your order when you are talking to someone on the phone. We don't know if you are taking to us or the person on the other end. Not to mention its rude. If you can't hang up at least put it down for a minute. I am sure whomever you are talking to will understand. This will eliminate getting your order wrong and will speed up service. Please have some respect and treat others as you would want to be treated. I understand some of you have never worked in a drive thru or say fast food so can't understand so take it from someone who does it everyday...its RUDE!!!!!
Note: This does not just apply to drive thrus or fast food restaurants please apply this to grocery stores, department stores and even just getting ice cream at Marble Slab. Thanks.