When I was I was an apprentice commercial photographer we used a Sinar monorail plate camera for advertising shots, typically 5" x 7" trannys, but sometimes up to 8"x 10". It was worth a fair bit and the Schneider lenses we used for it it were expensive too. Once, while working from the roof of a building opposite a hotel I was shooting, I looked down at the 3-4 storey drop to the ground and had an urge to drop the entire camera set-up off the top, just to see it smash to bits way down below. I didn't do it, but hell it would have felt good and I didn't care why. It would have been tough trying to do the same quality of work on the Hasselblads which were only 2.25" square image, if I'd bust the Sinar set. Some time later I confessed my urge to my photographer guru boss, he said this is called 'Imp of the Perverse'. EVER had such an urge - and DID you follow through ? I've has similar with 5L can of paint and new carpet laid in house. Mine seem to have been about destroying something valuable or smart, perhaps yours have a pattern too.