When checking out in a grocery store, the customer explicitly tells the bagger what items should go into what bag. Also if the customer is unsatisfied, he or she may take over the job using lines such as "I got this" or "I can do it"
#1 "Double bag those cokes so they don't break on me"
#2 Bagger - "Here let me help you with that ma'am"
Customer - "No I like my stuff bagged a certain way"
#3 Manager - "Go help him with his stuff"
Bagger - "Nah. Mans a backseat bagger, he glares at me anytime I try to help"