Saw these tonight… Xploderz grenades. $7.99 for a pack of 3. Reusable. Dip unto xploderz ammo to fill, throw, and watch the xplozion? Too dark outside to test, but looks like you can throw them at hard surfaces or maybe people? Will test in the future!
If you have a cat, they might have as much fun.
Foam From Above 