OK here are a couple that come to mind:
1. When I was a child we were on a beach in Dorset (UK) that was sort of garvel. Anyway we lit a driftwood fire to cook on and sit round, as we used to. Everything went well – sausages, dampers etc until we started hearing pops from the fire – I was wearing some sort of nylon / polyester trousers (hey – it was the 70’s – I loved them they had sewn in creases and…..) and the next thing I knew an insect bit me on the leg which made me jump. Except that it left a small molten hole in my (prized) trousers that kind of fused to my skin.
That was just the start – gradually the frequency and intensity increased - the damp gravel that the fire was burning on was starting to explode, sending fragments of hot gravel flying. Needless to say we doused the fire PDQ!
Yes – it still sticks in my mind.
2. My wife and I had an impromptu lunch grill in our back garden one sunny summer day with a disposable grill that rests on the ground. Obviously I wasn’t going to use it on the grass as it would leave a rectangular scorch mark, so we naturally grilled on the patio that was made of concrete slabs. It was great as we sat on the ground around it dressed for summer and carried on drinking wine while it burned itself out. Being a careful soul I took the wine glasses indoors before taking the grill to the garden tap to douse it before putting it in the bin. As I did this I heard a scream from my wife, who had taken some of the crockery / detritus indoors and had returned for the rest. We both had bare feet and the spot where the grill had been was no longer obvious – until she stepped on it that is. No serious damage done, just some reddening of the sole of her foot and some choice words about me.
I may add I went through a phase recently of regularly finding the compost heap smouldering away after putting barby ash on it (it counteracts the hen droppings well). Once I only noticed it after three or four days of wondering what the acrid smell was when I took the dog out in the morning and another time I had been out for a walk and wondered where all the smoke was coming from on such a nice day only to find two foot flames licking up from the heap as I came through the gate. Time for the garden hose.
I also remember my brother and I peeing on a camp fire to put it out (we were kids then, honestly)- we never did that again, the smell was dreadfull