Where did you go my lovely?

This is just a proof provided by my dad about my son's obsession with the radiators. After unsuccessfully trying to fit his sister's big toys in the slots, he gave up and threw them into the paper recycling bin. While she is trying to retrieve them, the unmistakable look of longing in his eyes is quite unsettling ("Isn't there anything in this house that would fit through these slots?"). I wonder what we would find in our radiators if we were to open them. The funniest thing is that every times he manages to fit something in there, he is very surprised that it's gone ...