Well, a few days ago I got called out to a flat. Usual story, a nice place, new build, falling rapidly to bits, but a good quality EVVA cylinder on the door.
So the chap is very worried to show me his drivers license, etc. and we get chatting while I work about how sometimes people scam locksmiths. I was fairly sure he was ok, though. He was dressed up to go out, and his keys were inside, and it had slammed shut. He had just been sorting out some money for the evening, too.
I open the door, and he nips off to get proof he lives there – very through! Then we go through to the living room, and, sure enough, is a big cider flaggon, empty, with about a square metre of coins, stacked up!
“Sorry about this, it’s a bit of a tip. Are you ok with £1 coins?”
A few minutes later, I had £40 in £1’s in a plastic bag from the kitchen, rattling in my pocket. 
No problem for me, they went in the bank this morning.