On Sun, 31 Jan 2016 12:32:10 -0600, Mark Lloyd
wrote:

On 01/31/2016 11:08 AM, Meanie wrote:

[snip]

Now, visualize yourself unscrewing the bulb by grasping around
the lower portion of the bulb where the metal screw part of the bulb is
exposed. You unscrew the bulb a bit and then take a second grip of the
bulb and "BAM"! You got shocked! It's all because the screw part of the
bulb is now the "hot" connection and you became the path to ground.

Also, there's a thin piece of paper between the screw contact and the
outer shell of the socket. That paper could be torn and/or bent making
the exposed part live.

Or you could put 100 watt bulbs in a ceiling fixture rated for 60w.
with a glass globe around each bulb. After 20 years the plastic
around the metal socket crumbles and all you have is the metal
socket!!