Oh I'm being eaten by a boa constrictor

Sing along if you know the words!

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.

Whadaya know, it's nibblin' my toe.
Oh gee, it's up to my knee.
Oh fiddle, it's up to my middle.
Oh heck, it's up to my neck.
Oh dread, it's mm-mm-mm-mm...
(-Shel Silverstein)