I have done this song with groups, starting it off and the "passing the lyric" around the group. People will improvise the lyric with whatever their particular call is at that moment. They are not all keeper lines, but if you get a group of 8 plus people and do this song that way, you will have to pare your choices down to restrict it to eight minutes.

And besides:

If you need 8 minutes of lyrics,
Just tell Him what you want!

dw