The term 'Naughty Child's Christmas Gift' can be summarized as a gift of COAL. COAL is a combustible black or brownish-black sedimentary rock, typically occurring in rock strata in layers or veins called COAL beds or COAL seams. It is most often used as a fuel source, but it is also used to make coke, a fuel derived from COAL that is used in smelting iron ore. COAL has been used since ancient times for heating and cooking, and it continues to be an important energy source today.