?!?!!!

When my son came home yesterday night, I asked him, whether he had put away his bike in the garage. He sad YES, OF COURSE, mum!
This morning, when my daughter passed by the garage (you cannot see the garage door from our entrance), she shouted: mum, B. left the bike outside all night! It's frozen!!.
I still ponder what to do when he returns home... Shoot him? Sell him to a neighbour? Make him clean the bike in the bone-chilling cold?