Plumber Question:

☛ Tell me about an important goal that you set in the past.
☛ If you were hiring a person for this job, what would you look for?
☛ What are three positive things your last boss would say about you?
☛ Why did you decide to pursue this career?
☛ What was the most stressful situation you have faced?

Think of actual examples you can use to describe your skills. Just wait for them ending their questions then answer.
Talk about specific work related experience for the position you're interviewing for.