Because i clearly fail at learning my lesson...
atleast 8 times on full mains, (265V at my place due to all the solar)
most memorable was a hand held mixer that had been thrown in the sink to clean while still being plugged. I put my hands back in the water a number of times trying to make sense what in the water could make the tingling feeling, until i traced the cord coming out of the water...
a few kicks at 415V, that drives its lesson home, testing the trigger on a welder, while still leaning on the welder with my elbow, a few expletives but no marks or burns,
next up the rank, a few KV off a car ignition coil, that is a feeling i wont soon forget, it holds you far worse than mains can dish out, and even makes it very hard to move your face to say call out help, still no burns,
and finally, a non discharged CRT, i was poking around a bit of test equiptment looking for another error when my ear touched the step up transformer which was missing some insulation at the pin, it left a small singed area, and resulted in me wearing a 15KG bit of test equipment as a stunning hat until my flailing brought it back to the floor with me still wearing it, the hat did not survive the ordeal,