You are a most remarkable programmer, chipmunk. I just spent four and a half hours working on this one instead of my essay and still didn't get anywhere. Here's my best:

foreach(1..99){$b="\n$_ bottle@{[$_!=1&&s=>]} of beer";push@a,",\nTake
+ one down, pass it round,$d@{$d=$b.' on the wall'}\n",$d.$b};print re
+verse@a;
[download]

but the output isn't as nice as yours.

I had this great idea using quines and self-modifying code, but I was beaten by s///. The idea was to find every number in the program and decrement it by one with s/\d{2}/$1--/g but $1 is read only so I couldn't (my lesson for today). Oh well. The following code actually works.
Update: I don't know if it's just my browser but the second line isn't displaying correctly. It should be $b=99;$c=$b-1;. But it doesn't break to badly if $c gets mangled.

seek DATA, 38,0;                                                      
+          
$_=join("",<DATA>);                                                   
+         
$b=99;$c=$b-1;                                                        
+          
$b/$b;                                                                
+          
print "\n\n $b on the wall, $b.  Take one down, pass it around, $c on 
+the wall."
;                                                                     
+          
s/$b/$b-1/e;                                                          
+          
s/ (\$.)/$1 bottles of beer/g;                                        
+          
eval;__DATA__
[download]

____________________
Jeremy
I didn't believe in evil until I dated it.

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