When I was fresh new private I was posted to HQ & Sig Sqn. This was the time of the LONG training exercises, when we set up a tent city in the middle of no where and stayed there for 6 - 12 weeks at a time. Being HQ & Sigs, the Bde Comd (a BGen at that time) was bivouacked in our unit lines.
One of the duties of the Fire Piquet was to light the immersion heaters at Oh Dark Stupid before reveille. Being new, I wasn't familiar with immersion heaters so I asked my Fire Piquet Comd about it, as I was on the shift involved. My instructions were:
"Starting at the General's area turn on the gas tap, proceed to the next heater around camp until they are all turned on. On the second go round, throw a lit match down the hole. Don't look into the hole, there MIGHT be flash that MAY cause burns to your face"
Being a good and obedient Private, I followed these orders to the letter. Only one heater was lit that morning - the General's. The launching of the chimney pipes, which landed (still burning) on the canvas attached to the General's office/bedroom van was a sight to behold.
Later investigation (after we in the Fire Piquet performed our primary function of evacuating the occupant (the General) of the General's van and putting out the fire) revealed that the MCpl who was Fire Piquet Commander had a history of such practical jokes. The RSM and the CO took over from there, with the General as an interested onlooker.