More fun and cost less to cut a grape in half, save for a small flap, open it up and microwave it!!!!
Burned out light bulbs are also fun.
GO FOR IT!
NO GUTS NO GLORY!
For a long time, and way back when, I kept a ‘research’ old microwave out in the garage. The best was loosely fluffed up coarse bronze wool. Not steel wool. It’s a good time, although I suspect that x-rays may be produced. So be mindful of that.