Once, during a summer in the middle of University when I was having trouble making ends meet, I took a job as a door-to-door double glazing salesman. It was the worst job I've ever had, and I was abysmal at it (I hated lying to people to try to make them want to buy something that they didn't really want and generally didn't need). I hated every minute of it. All of the work was on commission, and I'd been told that it usually took a few days at it before you got the hang of it, so I stuck with it for just over a week. That's when I got my first sale; some lady who'd thought my pitch was worthwhile. But she called up the company later that day to say she'd changed her mind and didn't want a quote after all, and I realised that no matter how hard I tried, I'd never be enough of a con man to be good at this job (which I already hated). I simply didn't turn up for work the next day. When my boss called me, I said, "You didn't lose any sales by me not being there. This really isn't for me; I quit."