I am slowly going crazy (left hand cupping right elbow, right
hand on chin)
One, two, three, four, five, six, switch (switch: R. hand on left
elbow, L. hand on chin)
Crazy going slowly am I 
Six, five, four, three, two, one, switch (switch back)

(Repeat song a number of times, getting faster and faster)

I wasn't aware there were other versions of this song! Here's a
cute one:

I don't care if I go crazy
One, two, three, four, five, six, switch
Crazy go I if care don't
Six, five, four, three, two, one, switch

I had a dog his name was Fido
I had raised him from a pup 
He could stand up on his hind legs
If you hold his front legs up

I had a dog his name was Dofi 
I had pupped him from a raise
He could hind up on his stand legs
If you front his hold legs up