Ah, now here's a good 'un.....
A non FAC air rifle shooting mate noticed a few empty HMR cases in my car and asked if he could take a few. Not thinking anything of it I said "help yourself"
The next time I saw him he told me this story;
Remember those bullet cases you gave me?.... err yes

Well I gave them to Edward (his girlfriend's son) and he went to stay with his grandparents, who found the brass cases in his pocket. They questioned Edward and he told them "Chris gave them to me"
They asked where he got them from? and he said that Chris has an air-gun in the loft. But Grandad knew these were definately not for an airgun.
They spent an agonising week thinking the worst of Julie's boyfriend, because they knew he hasn't got a FAC. And when they eventually spoke to Julie about it she assured them that Chris's mate let him have them.
Pheww what a relief, but at one point they considered calling the police
So be careful, giving cases to young'uns,, they could take them to school to show off and cause mayhem.