how about this one then.
bell ringinging, keypad dead, no mains on panel, turns out (now this is 100% true) it was raining, bloke threw umbrella into cupboard, umbrella slipped on floor, tip of umbrella touched mcb off button, panel battery takes over, runs panel for 9hours then off it goes.
this was known becuse umbrella was still leaning on off button.
I could go on (my mate has told me loads) but there are true, genuine and sometimes amusing, but most people can not wire alight let alone an alarm, so not sure the forum would be a good idea.