The officer was "hit mistakenly by a taser shot meant for the suspect" during an arrest attempt, and the stun gun's two electrified darts hit his upper back and the back of his head. Immediately after being shot he was found by his colleague to be unresponsive and foaming at the mouth," according to a report published in the Canadian Medical Association Journal (CMAJ). The seizure continued for about a minute and the officer did not regain full consciousness until he was taken to hospital, where he then felt dazed for several hours.
OK, the cop lived. But I'm sure others might not be so keen on a brain tase. I can't imagine many epileptics enjoying it one bit.