I recall looking for a summer job when I was 17. I found a position as a Tea Boy on a building site advertised in a job centre. The woman on the desk insisted, "make sure you dress really smart, first impressions are very important". I pointed out that the interview was on a building site, but she insisted.
I turned up on this building site, in a bowler hat, 3 piece suit, with a brief case and brolly. (even though we were in the middle of a heat wave). Having found the site foreman, I then produced my letter of introduction from the Job Centre. He then read it, looked at me and split his sides laughing. He then pointed out that it would include general labouring and said "You wouldn't last a week in this job". I then replied "I'll bet you a tenner that I last 6 weeks". I got the job, and 6 weeks later, he gave me the tenner.