Toys I want but should not own.
I once opened up a huge 8-platter hard drive to get at the two powerful magnets. Magnets are great fun. It only took me 10 minutes to get a knuckle painfully stuck between them, and I realized that these toys were much too dangerous for me. I threw them away, once I managed to free myself.
Imagine if I had a couple of 3 inch diameter, 1 inch thick, grade N45 magnets to play with. They'd probably kill me.