Well, I don't have the others memorized or written down, but here's mine 
from the Punniest of Show contest.  The song at the end is sung to the 
tune of "Thank God I'm a Country Boy" by John Denver.  Brace yourself...
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I met an inventor who lived in the country named Zack.  He invented an 
alarm clock that had a fife instead of a bell, and painted it in a black 
laid satin finish.  When it went off, the fife would play and a mechanical 
ram would butt him out of bed.  However, it didn't always work.
Zack was a wierd old man who made a hobby out of catching flies, pouring 
oil on them, and stuffing them in a burlap sack.  He never married - instead, 
he whittled a wife out of a green pine log that leaked sap until it formed 
a scummy crust around her midsection.
Zack's diet consisted of pies made of butt steak carved from mutton, stuffed 
with fluffed oats and bubble gum that would explode at the slightest shake 
when warm.  He'd follow this with a honey bun and a handful of Skittles 
candy. However, he knew there was more to life than this, so sometimes 
he'd have his favorite dish:  rank, stinking codfish served with country 
style Hawaiian poi with gravy.
Now, Zack's life was strange, but he was happy with it, and he told me 
about it in a song that goes like this:
     Oh, fife on alarm, the kind that's laid black,
     Ain't buttin' up a country boy like me named Zack.
     I'm oilin' the flies, I put 'em in the sack:
     Rank Cod and some Country Poi.
     Oh, I got me a pine wife that I like to whittle,
     Got scum comin' up and it's caked 'round her middle.
     Life ain't mutton butt, a honey bun, and Skittles:
     Rank Cod and some Country Poi.
     Yeah, a mutton butt pie with a fluffy oat middle,
     Got gum blowin' up if you shake just a little.
     Life ain't mutton butt, a honey bun, and Skittles:
     Whoo!  Rank Cod and some Country Poi!  Yee-hah!!!
(Time used:  80 seconds (10 under the limit of 90))