The words I are evidently the same or similar to Guest's, above. I got it from Evan Leonard. The verses all work up to the big finish -- one of the worst (best) puns in history:

At our local sewerage farm
There was cause for alarm
When a man fell down a pit a year ago.
Since the accident occurred
He's been lying there, interred
I'm glad I'm working down below!

Bat Goddess (damn! I'm going to be away from the computer until sometime Sunday)