A Christmas Song Songtext

Once in Royal David's City stood a lowly cattle shed,
where a mother laid her baby.
You'd do well to remember the things He later said.
When you're stuffing yourselves at the Christmas parties,
you'll laugh when I tell you to take a running jump.
You're missing the point I'm sure does not need making;
that Christmas spirit is not what you drink.

So how can you laugh when your own mother's hungry
and how can you smile when the reasons for smiling are wrong?