Final answer:
Fellow customers can have a negative impact on a service experience by exhibiting behaviors such as arriving late, conveying lack of confidence, or having a negative attitude and/or a lack of enthusiasm.
Step-by-step explanation:
Fellow customers can create a negative impact on a service experience if they exhibit behaviors such as arriving late, conveying a lack of confidence, or having a negative attitude and/or a lack of enthusiasm. These behaviors can influence the overall atmosphere and customer satisfaction. For example, if a customer arrives late to a restaurant and conveys a lack of enthusiasm, it may create a negative impression on other customers and affect their experience.