Me Mother Is Gone to Church
Me mother is gone to church.
She told me not to play with you
Because you're in the dirt.
It t'isn't because you're dirty,
It t'isn't because you're clean,
It's because you have the whoopin' cough
And eat margarine! [or "from eatin' margarine"]
The Clancy brothers tell a bit of the story and recite the rhyme here starting at 3:27 -
This poem was an oral folk news warning to not eat the new-fangled margarine because people had noticed that those who did were more likely to get the sometimes-deadly whooping cough that reached epidemic proportions in the early twentieth century.
The Irish were right to link manufactured margarine to ill health:
People have forgotten this poem and its lesson and vaccination rates have been declining, so the whooping cough is slowly on the rise again:
Number of whooping cough cases doubles this year (Ireland)
Whooping cough epidemic declared in Vermont (USA)