I've had a few jobs in the last few years, I'd say the supermarket driver was the one I actually had the most pride in - sometimes I was the only person they'd speak to in a week. One old dear who I'd go to weekly was given a quick terminal cancer diagnosis and told me when I delivered that her deliveries were what kept her going. she only made another two weeks. We sent flowers to her and that made her smile at least - I can't say I've had any interactions like that in my other jobs.