Yes, sticking a metal fork or any metal object into a toaster, even when it's off but still plugged into the wall, is dangerous and should be avoided. Here's why:
Electrical shock hazard: When a metal object is inserted into a plugged-in toaster, it can make contact with the toaster's electrical components. Even though the toaster is off, there may still be live electrical parts within the appliance. Accidentally touching these live parts with a metal object can lead to an electrical shock, which can be severe and potentially life-threatening.
Risk of damage: Inserting a metal fork into a toaster can damage the heating elements, the internal wiring, or other components. Damaging the toaster may render it unsafe for use or even cause it to malfunction when turned on later.
Fire hazard: There is a potential risk of starting a fire if the metal fork causes a short circuit or if it gets caught in the toaster's mechanism when it is eventually turned on.
To avoid accidents and ensure safety, it's essential to refrain from inserting any metal objects into a toaster or any other electrical appliance. If you need to retrieve something from inside the toaster, make sure it is unplugged, and use non-metallic objects like wooden tongs or plastic utensils. Always prioritize safety and be cautious around electrical appliances to prevent accidents and injuries.