Tel on Tel Episode 2

During My days as a cowboy erector (can't touch you for it) I found myself assisting a rather miserable electrician as he wired up one of the ovens we manufactured. He repeatedly sent me out to the van to fetch this and that, make the coffee, buy his fags (oh, that's cigarettes for the American readers, not...well never mind), so I was well fed up with him.
I decided to get my own back. As he was standing on a step ladder wiring up a light fitting above his head, I crept behind him and clapped my hands loudly while simultaneously elbowing the room light switch off.
I had, of course, badly misjudged the overall effect of my actions. When I turned the light back on I found that he had firstly leaped up in the air in surprise. This accounted for the Light shade jammed firmly on his head. Secondly he had steped back. This resulted in him becoming trapped in the rungs of the stepladder. He wouldn't have been so badly injured had his third response not been to switch on the lights in the oven, sending 240V through his head from the shade he was wearing.