I was installing a new light fitting and I was in a rush because I had to go out. Yep, rushing isn't clever. I normally turn off both the lighting the sockets, and I normally test the terminals with a screwdriver before touching, but because I was in a hurry I skipped these. I started splicing into the junction box... neutral ok, earth ok, live - ouch! It was a junction box for the sockets, not the lights - I'd misidentified it. Stupid zebra.
That said, it didn't hurt as much as I expected, and I didn't fall off the ladder. I didn't even swear, although I did let out an "aargh!" :P
