I wrote this for singing at summercamp(with the help of a couple of good kids!) many years ago:

(talking blues in "G")

I woke up this morning had one in my socks
even had one in my tinderbox.
Went downstairs got one in my ear
how in the world am I supposed to hear?
Oh Well,

There's heffalumps here and heffalumps there
heffalumps, heffalumps everywhere
If I miss a chord here, skip a word there
tweedledum, tweedldee I don't care.

I was walking in the fields today and saw
one out in the new mown hay. I got out my
heffalump gun, and funny how the heffalump
did run away.

There's heffalumps here and heffalumps there
heffalumps, heffalumps everywhere
If I miss a chord here, skip a word there
tweedledum, tweedldee I don't care.

I went downstairs to eat my soup and I heard
one out in the chicken coop.
It came inside and licked my face, and
when a heffalump comes inside and licks your
face, you'll never again shoot one with a
blunderbuss.
And BOY ARE THEY PROLIFIC!

So now
There's heffalumps here and heffalumps there
heffalumps, heffalumps everywhere
If I miss a chord here, skip a word there
tweedledum, tweedldee I don't care.

(I still get requests for that when
I go to camp, too!)