And it is:

I'M BEING EATEN BY A BOA CONSTRICTOR

Oh, I'm being eaten,
By a boa constrictor,
A boa constrictor
A boa constrictor;
I'm being eaten by a boa constrictor
And I don't like it one bit.
Well, what do you know?
It's nibblin' my toe
Oh, gee,
It's up to my knee.
Oh, my,
It's up to my thigh
Oh, fiddle,
It's up to my middle.
Oh, heck,
It's up to my neck
Oh, dread,
It's upmmmmmmmmmfffffffff…
~Shel Silverstein~

I remember a few of them... surprisingly enough, I think I know all of "Sidewalking" and I remember liking one about carrots. I'm planning on doing some SS rereading soon, so I'll come back to state an official favorite for the record. =P

Sick
"I cannot go to school today."
said little PeggyAnn Mckay.
"I have the measles and the mumps,
a gash, a rash and purple bumps....
Oh well, can't remember the rest.

I cannot remember one but their are alot of his poems i enjoy.

i actually have two :) for sale and invitation

I have Many favorite poems by him