I'm not sure who was the SS here, my neighbour or me ...
This is going back a few years when we were having a very cold day where I live, and the battery in my car was being temperamental. My car refused to start one morning, and I didn't know what to do. I saw that my neighbour was getting ready to leave for work, so I went up to him. (Sidenote: we'd never met or spoken to each other up to that point.)
I said "Excuse me - do you have jumper cables?" He looked startled and said "... Yes." "Would you mind giving me a boost? My car won't start."
His response: "No, because then I'll be late for work."
Now - I realize that he didn't know me (although he saw me walking across the back lane, so he knew I lived close by). I also realize that I was asking him to do a favour for a stranger, and that doing said favour would have taken a few minutes. But it would only have been five minutes, tops - probably not even that.
Because he refused to help me, I had to call the auto club where I live, and the upshot was that I was late for work - about three hours late.