How reliable are defibrillators - they can keep going after you are gone...

After the patient passed away, the defibrillator just kept on going...a magnet was needed to disarm the device...the gift that keeps on giving....BD

Except nobody remembered to tell his ICD. The damn thing just wouldn't give up! Long after the patient had basically expired, long after his heart had lost the ability to beat in any sort of functional pattern, the silly thing kept pacing away and periodically issued a shock, which caused the patient's body to twitch in a manner most distressing to the family.
A frantic search ensued for a magnet. Placing a donut-shaped magnet over the device deactivates it, and we keep one in the ER for just such an occasion.

Movin' Meat: Grim Irony