A group of us were on a fell walking holiday in the Lake District. Only Henry smoked and he used to get a bit of stick about it. Julian had come armed with some Joke explosives that you tucked into the end of a ciggy, and when the fire got to it BANG the smoke exploded. When H left his packet about the things were secretly inserted.
Anyway were out in the hills and had stopped, sat down, for Henry to have his ciggy. This was back in 1982 and the Falklands war was in full swing.
As Henry lit his ciggy he looked at his watch 12 noon, I think.
"The total exclusion zone starts now" he announced
With which there was a BANG and his cigarette was left a shredded stump in his fingers...........Perfect timing
We still enjoy a chuckle over it 28 years later.