This is just how ungrounded devices sometimes act when you are able to come into contact with the neutral via some current path. I have LED light bulbs that are

This is just how ungrounded devices sometimes act when you are able to come into contact with the neutral via some current path. I have LED light bulbs that are like this, you feel a vibration when touching the exposed metal heatsink of the bulb, and some bulb fixtures have started to be manufactured with a ground wire on the chassis just to eliminate that.