Polar Magnet Pen + Stylus
Pens lend themselves to being taken to bits. The downside, of course, is that they can tend to either not go back together again, or go into full octopus panic mode and get ink all over the place. However, The Polar Magnetic Pen is designed to be dismantled without leaving you spattered with ink.
It’s a ballpoint pen encased in a stack of strongly magnetic neodymium hoops, with which you can monkey about like an older, yet equally easily amused, version of your child self (you can stick to them sides to make different shapes, for example), or you can use the pen for writing. The pen’s appeal will be proportionate to your reason for wanting one. As a writing implement, it’s relatively heavy and not that comfortable to hold, but you can’t go too far wrong with magnets for procrastination, and if you do go wrong, you also get two spare sections.