You’ve probably seen those water balls that you use to make your orchids look pretty on your desk. They start life as a tiny bead, add some water and then boom! Huge. But did you know you could get glow in the dark ones? You can, Glow in the Dark Spitballs for all your play needs.

These balls grow up to 200 times their beginning size, so it’s probably a good thing they start so small. Just add a bit of water and a pinch of these can turn into a handful. Mostly people use them for plant reasons but you can totally play with these. Throw them and watch them explode!

Or you can keep them. As they dry out, they return to their normal size. Just add water again for the fun, big ones. You can use these to give that silly decorative plant in your hallway a second life as night light. There are 1,250 Spitballs in a pack, far more than you could possibly use for any real purpose. Glow in the Dark Spitballs are $9.50 a pack.