Found It!

"Mom, you know the two couches in the basement, the ones we've kind of abused over the last couple years while playing Xbox, watching TV and maybe having a snack or two on when we know we shouldn't ? In the basement, where you don't like to go because there's always tons of Legos all over the floor, and maybe some of those snack wrappers that aren't supposed to be down there? Well, I've been missing a DS game and I think the couch ate it. Could we please turn the couches over and see if we can find it?"

"If you boys completely clean up the basement first, then I'll go down there and help you turn the couches over, cut slits through the fabric-stuff that keeps everything trapped inside, and we'll see if the couch really did eat your toy."