I was speaking with one of my workers the other day and used the word "niggle", to which he looked stunned and said, "The hell you just call me?" Human resources had me in for a chat afterwards. A friend was smoking a cigarette while we were working on his bike, I said "Finish your fag, we have work to do." His reply? "My sexual preference is none of your business, you toxic asshole." He then stormed off, leaving his rainbow brake levers (with penis decals) on my workbench.
I recall, as a young man, my friends coming to my house (in America) would always ask what language my Mother was speaking.
I always get the feeling Guy Martin is about to say or do something completely inappropriate. One of the TT documentaries I watched had him, while working on a lorry, talking about wanking in a van on race weekends. In the disconnected Guy Martin way of speaking, it was hilarious.