Twice in the past two months, complete strangers have asked me to keep an eye on their bag while they went to the toilet or bar. The first was in a taxi queue, and the guy turned to me and said "can I leave my bag in the queue for a minute?" and then walked off to the toilet. My turn for a taxi came before he got back, so I had to leave, and ask the guy behind me to watch the bag - he wasn't keen, but luckily the bag guy came back at that point. I would NEVER leave my bag alone with a stranger. Strangers are untrustworthy, evil, and possibly insane. Just like my mum told me all those years ago.
Apart from anything else, if you leave a bag unattended the bomb squad might turn up and destroy it. People blowing stuff up has become a bit of an issue in the past few years, you may have noticed things on the news. You leave a bag alone, people panic. But let's pretend they don't. Let's pretend that we can see into your bag, and there is nothing explosive inside. That just means it's a more tempting target for thieves.
The other week, it happened to me on a train. "Excuse me," said the guy opposite me. "I just need to get some food, is it all right if I leave my laptop bag here?" Yeah, sure, of course it's all right. Is it all right if I steal it? You've even *told* me it's a laptop! Don't say "laptop", just say "bag". Maybe I had no intention of stealing his bag, until I found out there was a laptop inside - he didn't know me, or what I was capable of. Again, I wondered if it was a bomb, and if I was being incredibly naive. But he came back shortly after, with some food. So it was definitely a laptop. That he left alone with a stranger. My laptop is never out of my sight if I take it outside, not for a second. Because it's a laptop, and they're expensive, and I don't want someone to pinch it.
Don't leave your valuables alone with strangers. They'll nick them. This isn't some technicolour 1950s world where people leave their doors unlocked, and put freshly baked apple pies on window sills to cool, and stay a virgin until they get married. People nick stuff. Don't give them the chance.
So anyway, if anyone wants to buy a second hand laptop, one careless owner, only 50 quid, contact me at the usual address.