Young children are fascinated by electronics. From dunking the TV remote control in the toilet and then hiding it in the hamper to opening and closing the DVD tray a hundred times, electronics have enormous appeal. Come to think of it, that DVD tray can be pretty vulnerable. Your child may not have the requisite DVD to make the system work, but adding a cookie, sandwich or dog biscuit might seem almost like the real deal to a child and result in a repair bill for you. Imagine your joy when you discover what your little darling has been putting in there. It kind of gives "play" a whole new meaning.
PS: Watch your toaster, too.