I keep thinking about a sweet lady I once knew. Her father-in-law had a pacemaker inserted and he was to come and live with her. She was happy to care for him but had one great fear.
"They have a detonator built in to them", she told me -- of pacemakers.
"When they wear out -- they just explode. Can you imagine the mess if it explodes when he's sitting in my kitchen?"

I could. I still can. The image burns more brightly than ever now.
Cheers, Joy