There's a number of versions of this children's rhyme that mentions snakes [among other things]:

Coca Cola .. Came to town
Diet Pepsi ... Come on down

Theres a place on mars where the women smoke cigars
Every puff they take is enough to kill a snake
When the snake is dead they put roses on its head
When the roses die . they put diamonds in its eyes
When the diamond break .. they begin to make a cake
When the cake is done ... it'll be 1991
http://blog.oftheoctopuses.com/000518.php posted by heather at March 18, 2006


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theres a place on mars
where the women smoke cigars
and the men wear bikinis
and the babies drink martinis
every step you take
is enough to kill a snake
when the snake is dead
you put diamonds on his head
when the diamonds crack
you put mustard on its back
when the mustard dries
its year 1969.
then you tell the king
and the king says FREEZE!
http://blog.oftheoctopuses.com/000518.php posted by September at July 11, 2006

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[Also, a version of this rhyme was given in a Mudcat thread. I'm reposting that entire comment. I hope it is alright to do so]:

In The Land Of Oz
Some dim fragments from my far-off childhood.. "Say say my playmate, come out and play with me" was popular for both skipping, clapping, and elastic games. And finally, there was "In the land of Oz" which was also multipurpose.


In the land of Oz
where the ladies smoke cigars
Every puff they take
is enough to kill a snake
When the snakes are dead
they put roses in their head
When the roses die
They put diamonds in their eye
When the diamonds break
It is nineteen-(sixty)-eight!

This of course had its own risque variant: "In the land of Oz / where the ladies don't wear bras / but the men don't care / cause they don't wear underwear!"
Mudcat; "Child's Game: Elastics", posted by Bard Judith, 26 Sep 05

[I tried to find the thread URL by putting "children's games elastics" in the search engine-without apostraphes-but got 'no results']