100 world challenge

My friend had just got back off holiday so i went round to see him he told me he had a wonderful time and he had got my a present. He came back running down the stairs with a parcel in his hands “here you go” i unwrapped the present and inside i was pleased to find a brand new remote control car i said thank you and asked if he had any batteries he said yes and sprinted back upstairs and came down with batteries clutched in his hand. But when i put the batteries in it it went BANG! the whole car exploded shock was the only emotion.