Man, I was troubleshooting a flickering light in this old service panel when I accidentally brushed a live bus bar with my Klein multimeter probe. Shoulda double-checked the breaker, but I was rushing after a long day. Got a good jolt through my arm, nothing major but it shook me up bad. Reminded me of that near-miss story I read on r/electricians last week about a guy who forgot to lock out tag out on a 240V subpanel. Always test for dead before you touch anything, even if you think it's off. Seen too many sparks fly from sloppy habits like that. If you're a newbie, invest in good insulated tools early, it'll save your ass one day. Edit: yeah, my heart rate was through the roof for an hour after.