…when it’s Sunday evening and suddenly lights go off.
You go check the switchboard, but the safeguard refuses to stay on. You go everywhere in the house unplugging everything and try again: the safeguard still switches power off.
You give in, and dine with candle light, thinking “bugger, I can’t read my emails!”. 😉
…eventually, you remember you have missed the oven plug: that little hidden bastard had short-circuited and melted! Fighting with the flashlight, you dismantle it, restore power and blog about the incident. 🙂