I was in the City a month ago waiting at Flinders Street Station for the train home at about 10pm. The only station colder is Richmond so I thought I'd warm up with a hot chocolate. I ordered and paid and then the next customer ordered and discovered he'd left his wallet at work. So I paid for his drink. We ended up having a really nice conversation which was worth far more than the hot drink! It takes so little to make someone's day but paying for someone's petrol is fantastic. What a kindness.