It's a long story, but my company passed out small nerf baseballs to everyone as stress relievers. Instead of squeezing them, everyone bounces them off the walls all day and it's driving me crazy. I've asked them to stop, and they don't. I would take them and throw them out, but then I can get in trouble for stealing property off someone's desk. I also don't want it to be obviously destroyed, like cutting it in half, because they will know it's me. I want to destroy its ability to bounce without it appearing to be tampered with. I also just want to mess with their minds for fun. Is there anything I can inject into the nerf ball that will destroy it's bouncing ability? Is there something I can cover the outside of it with that will also destroy it? Nothing obvious like super glue, because they will know it's a prank. I want it to appear like a complete mystery to them.