I was going to post the words to "Never Swat a Fly" (1930) but they're nowhere to be found on Mudcat. Let's see what I can remember...

Never swat a fly
He may have another fly
He may sit with her and sigh
The way I do with you.

Never harm a flea
He may have a favorite she
That he bounces on his knee
The way I do with you.

Never harm a bee if he is going anywhere
You may be concluding some terrific insect love affair.
Be careful.

Don't step on an ant
In the middle of a plant
He may want to but he can't
The way I do with you.