It's not really that meaty, although it was potentially dangerous I suppose; I was a relatively naive longhaired 17-year-old, and I used to hitch-hike all over the place. One time, I was coming back from West Wales, and I got picked up by what seemed like a fairly friendly lorry driver - a little too friendly as it turned out.
After an hour or so on the road we pulled into a layby where he got his flask out (not a euphemism!) and made with the tea. While we were drinking our tea, I noticed a) a soft, rhythmic sound coming from somewhere (not the radio) and b) his right hand was thrust into his trouser pocket. Put two and two together and you will come up, correctly, with about four.
At this point, the conversation became increasingly, umm, personal shall we say, culminating in his offer to, well, give me a bit of a seeing to in the back of his lorry. I declined his offer, quite graciously I thought, but at that point he refused to take me any further, claiming he was turning off very soon, so I had to try and thumb a lift from the most godforsaken and remote layby in all of Wales after he'd driven off. At least he didn't turn nasty, although to say the least the experience was uncomfortable (again not a euphemism).
All part of life's rich tapestry of experience and learning, I suppose...