Like a lobster I can swim
And can grow another limb
Where a powerless stump you saw
I have grown a powerful claw

When you'd thought me safely drowned
In the depths I swim around
Dither when you do descend
With my claw I'll tear you, friend
[ Lyrics from: http://www.lyricsfreak.com/f/fairport+convention/the+lobster_20231615.html ]