To the tune of "She'll be comin' 'round the mountain"

If you're in a bad position,
Call for Groo.
He will join your opposition,
Call for Groo!
If a slow death is your worry,
Call for Groo in a hurry.
He will kill them all for you.
Call for Groo!

That was actually published in one of the comics, I still remember it after all this time.

Bren R.