Well I was just checking the timing on my car and when I grabbed a hold of the distributor to make a small adjustment, I was pleasantly awakened by a nice jolt of electricity. Is it time for new plug wires??
You think that's fun? Try grabbing a live 220 wire by accident. That was life changing for me..lol. Yea, don't go grabbing a hold of all at the same time. Another possibility could be a cracked cap. The crack will be almost impossible to find, sometimes, but you'd get the same result when grabbing a cracked cap.