Hi Discounted Girl,
Written in the 1920's? Ack!!! Of course, in my extreme need to be correct

I also did a search and found many attributions to Max Erhmann as you did and a couple to St. Paul's Church in Baltimore, dated 1692. But maybe they meant 1962 and left Max out of it... Thanks for the definition--it's great!
I may completely undo the good of the first post, but I also found this version (many parodies of this poem abound). I remember hearing this one on the radio when I was growing up. Imagine Leslie Nielsen reading it totally deadpan and women singing the refrain. Can't resist, here goes, again with my favorite parts in bold

:
FLUKE OF THE UNIVERSE
Go placidly amid the noise and waste,
and render what comfort there may be in owning a piece thereof.Avoid quiet and placid people, unless you are in need of sleep.
Rotate your tires.
Speak glowingly of those greater than yourself, and heed well their advice,
even though they be turkeys.
Know what to kiss, and when.Consider that two wrongs never make a right, but that three do.
Whenever possible, put people on hold.
Be comforted that in the face of all idiocity and dissolusionment, and
and despite the changing fortunes of time,
There is always a big future in computer maintainance.
You are a Fluke of the Universe.
You have no right to be here,
and whether you can hear it or not,
the Universe is laughing behind you back.
Remember the Pueblo.
Strive at all times to bend, Fold, Spindle and Mutilate.
Know yourself.
If you need help, call the F.B.I.
Exercise caution in your daily affairs, especially with those persons
closest to yourself.
That lemon on your left, for instance.be assured that a walk throught the ocean of most souls would
scarecely get your feet wet.
Fall not in love, therefor, it will stick to your face.
Gracefully surrender the things of Youth, Birds, Clean Air,
Tuna, Taiwan.
And let not the sands of time get in your lunch.Hire people with hooks.
For a good time, call 606-4311... ask for Candy.
Take heart in the deepening gloom that your dog is finally getting
enough cheese.
And reflect that whatever misfortune may be your lot,
it could only be worse in milwalkee.
You are a Fluke of the Universe.
You have no right to be here,
and whether you can hear it or not,
the Universe is laughing behind you back.
Therefor, amke peace with your god, whatever you may percieve him to be;
Hairy Thunderer, or Cosmic Muffin.
With all its Hopes, Dreams, Promises, and Urban Renewal,
the world continues to deteriorate.
GIVE UP!
You are a Fluke of the Universe.
You have no right to be here,
and whether you can hear it or not,
the Universe is laughing behind you back.