Just fiddling away the night, had this to show for my efforts. Was trying to get a different effect, but ended up with:

#!/usr/bin/perl

sub _{ $_[ 0]=~s*_* *g&&$_[0]}$\=",";sub __{$_[0]=~m*$/$/$/*;eval"sub 
+".$1.$2."{
return'".$3."'}";return\&{"$1$2"}}$/=q*(\w)*;map{$#{$_}?$#{$_}++&&__$_
+:'';$#.=&{
__$_}}qw*MIJ whu sis mut _2_ wha  wan  moo  not  teh  sue  her  _1_  Z
+EP wee err
URl     _0_     hah     aha    acc     aCk     Ace     jar*    ;    pr
+int    _$#
[download]

Nothing special, just another JAPH (that's not recursive, is it?), and was reminded of those having long strings with no letters, etc. So here it is, and enjoy!

$/  =  q#(\w)#  ;  sub  sig { print scalar reverse  join  ' ',  @_  } 
+ sig
map { s$\$/\$/$\$2\$1$g && $_ } split( ' ', ",erckha rlPe erthnoa stJu
+" );
[download]