D5            A5               D5                      G5
When I was just a wee little lad  Full of health and joy
   G5               D5                  E5            A5
My father homeward came one night And gave to me a toy
     D5        A5                 D5            G5
A wonder to behold it was with many colors bright
        G5             D5                E5               A5
And the moment I laid eyes on it. It became my hearts delight


Chorus:
        D5           A5                        D5                   G5
It went zip when it moved, bop when it stopped and whir when it stood still
   G5              D5                 A5            D5
I never knew just what it was and I guess I never will


The first time that I picked it up I got a big surprise
For right on the bottom were two big buttons that looked like big green
eyes.
I first pushed one, then the other, then I twisted its lid
And when I put it down again, here is what it did.

    Chorus

It first marched left, then marched right, then marched under a chair.
And when I looked where it had gone, it wasn't even there
I started to cry, but my daddy laughed for he knew that I would find
When I looked around, my marvellous toy, just a'chugging from behind.

    Chorus

Well, the years have gone by too swiftly it seems, I now have my own
  little boy
And yesterday, I gave to him my marvelous little toy.
His eyes nearly popped right out of his head, he gave a squeal of glee
Neither one of us knows just what it is, but he loves it just like me

    Chorus


I've been doing this song for MANY years and (if I remember correctly
without my guitar in hand) generally play it in C but the chord progression
is simple enough to allow it to be played in whatever key fits your vocal
range.