Ah reminds me. My dad did smoke. And as tobacco was taxed differently he had once used one of these small sliding machines to put tobacco into "empty" cigarettes, sold separately.

He had stopped using these and was back to store bought cigarettes when I found his cigarettes and the machine.

I carefully pulled out all the tobacco from one of his Camel filters, and put it back in with the sliding machine - adding the tiniest firecracker I had.

Few days later he was sooooo angry. And the angrier he was the more I had to laugh.

It did explode in his ashtray when he was concentrating at his desk.

Oh fuck, thats was over 40 years ago and I still have to laugh like a madman.

Remembering him fondly, even when he was mad as hell at me the worst that would happen was him shouting.