As a second regards the microwave, depending on the age, please be extremely careful about the magnetron the insulators on which could contain beryllium oxide, which can kill you.
There are a lot of fun parts inside microwaves (a personal favorite is the high-torque-low-speed-line-voltage motor, which I use to make creepy Halloween decorations) but the caps, transformer, and magnetron are all useful for somewhat... more dangerous... pursuits.