Original lyrics:
If you chance to meet a frown,
Do not let it stay.
Quickly turn it upside down
And smile that frown away.
No one likes a frowning face,
Change it for a smile.
Make the world a better place
By smiling all the while.
Note: I think that it's fine to be sad and feel frowny for a while. When you feel sad but then feel ready to try and feel more positive, hopefully this song can help.
My suggested lyrics:
If you chance to meet a frown,
Know that it's okay.
When ready, turn it upside down
And smile that frown away.
At times you might be feeling sad,
And your face will frown.
Other times you might be glad
And spread the smiles around.