It's disloyal to leave a job shortly after beginning it.
John has just begun working at a coffee shop when an impressed customer, right in front of Carlos the owner, offers John a higher paying job at his sandwich shop.
John wants to respond to the customer.
John declines the customer's offer stating that he just began at this job, and he's not disloyal.
John tells the customer that of course he will accept the job as it's higher paying.
Carlos is happy to see John be a stand up person and is happy his choice to hire him has been validated in a way.
Carlos is angry that the training he just gave John is wasted and that he has to look for another employee.