Please don't experiment with cooking anything but bread in the toaster. They're extremely dangerous to fuck around with. Please also keep anything conductive out of a toaster when it's plugged in (even when it's not plunged down) if you use some soft metal like tinfoil there's a chance some gets stuck in the toaster and bridges a section of the heating element.

As for using a fork to fish it out that's generally not actually a problem - just unplug it first and make sure you're not scraping the element in any way (I occasionally toast home made irregular bread so I often use a knife, carefully, to extract it).

Toasters, especially old ones, oftentimes don't have an integrated fuse so you can really fuck shit up with one.