If you were to put a plastic fork or any other non-metallic object into a toaster while it is plugged in and operating, you are unlikely to get shocked. This is because plastic is a non-conductive material and does not conduct electricity. Therefore, it won't complete an electrical circuit and allow current to flow through your body.
However, while you might not get shocked, it is still not advisable to put any non-food items, especially plastic, into a toaster while it is running. Doing so can still be dangerous for several reasons:
Fire Hazard: If the plastic object touches the toaster's hot heating elements, it can melt or catch fire, creating a potential fire hazard.
Damage to the Toaster: Introducing non-food items into the toaster can cause damage to the heating elements, the toaster's mechanism, or the object itself, affecting the toaster's performance.
Toxic Fumes: Burning plastic can release harmful fumes into the air, which can be hazardous to your health.
Toasters are designed to toast bread and similar food items safely. Using them for any other purpose or inserting non-food objects is not recommended and can lead to accidents and damage. Always use the toaster as intended, and avoid inserting anything other than bread or food items into it to ensure your safety and the longevity of the appliance.