At St Andrews University in 1958, the words to Cwm Rhondda were:

||: You must eat when you are hungry.
You must drink when you are dry. :||
You must rest when you are weary.
||: Don't stop breathing, or you'll die. :||

||: Father's pants will soon fit Willie.
Will 'e wear 'em? Willie will. :||
Will 'e wear 'em? Will 'e wear 'em?
||: Will 'e wear 'em? Willy will. :||

The "Lloyd George" words to "Onward, Christian Soldiers" somehow managed to become a Girl Scout song in the U.S. From that, it was taken up, at least at Caltech, as a drinking song. I learned it there in 1954, and was confidently informed that the knowledge referred to was carnal. Far from home, in space, time, and sentiment!