It was due to be delivered this afternoon between 12:30pm and 4:30pm and they were supposed to phone me half an hour or so before they were due to arrive . I work only 10 mins drive from home so the plan was to pop out and meet them and come straight back to work . As luck would have it , they phoned me at 1 pm on the dot , the start of lunch break ( just as I was about to open my tin of beans for lunch !

Question: What is a cause of the narrator 's stress ?
Answer: They were interrupted during lunch .They dislike their lunch .They dislike driving .They hate work .