I have a fairy by my side
Which says I must not sleep,
When once in pain I loudly cried
It said "You must not weep."
If, full of mirth, I smile and grin,
It says "You must not laugh;"
When once I wished to drink some gin
It said "You must not quaff."
When once a meal I wished to taste
It said "You must not bite;"
When to the wars I went in haste
It said "You must not fight."
"What may I do?" at length I cried,
Tired of the painful task.
The fairy quietly replied,
And said "You must not ask."
Moral: "You mustn't."