We couldn't find it

Today, we hung around the house this afternoon. Cassie was eating Cheetos and Derek was playing dungeon with his Hot Wheels. (there's a castle that you shoot a little grey ball at that catches the cars). Derek got up to go to the bathroom, and I went to the kitchen to get a drink. When I came back, Cassie was still sitting by her Cheetos bowl apparently eating Cheetos because her mouth was full, and Derek was looking for something. A few moments later, he asked me if I knew where his ball was. After a few minutes of searching with no success, I told him to play with something else. It was a moment later that we found his ball...