Three boys (we borrowed two to entertain ours and because at least one has sick parents that needed a bit of relief) just built three water bombs out of paper. What do they do when they go outside with them, even though it's like 28° outside and snow is on the ground? Of course. Yes. They throw them at each other and then pull out the water pistols and start shooting.
I love my boys. I'm just glad I'm not one of them and dripping.