Just told Quiff this one, but happened to me today.
Car hasn't moved for a while and the battery was flat, so stuck it on the charger this morning and went for a spin this afternoon. Drove about 4-5 miles and stopped for petrol. Came back to the car and it wouldn't start, so asked a guy who was doing his tyres if he had some jump leads and would give us a jump start. Hooked leads up to my battery and he was hooking them up to his when huge sparks started flying (bearing in mind i was still parked next to the pump at this point). Anyhoo the garage attendant came charging out of the shop to tell us the error of our ways, but i was either too dim or distracted to realise what happened until a couple of mins later
