This is an animated obfu, so it takes a few seconds to run. It's been tested under linux only, I'd appreciate someone letting me know how it fares under windows. Enjoy!

#!/usr/bin/perl
*{'$'}=\*{_};*a=\*{1};**=sub{shift};sub'w(&@){$$[1]->();$$[0
]->()}sub ::8 (&){&*}sub't(&@){*{$$[0]->()}=$$[1]->();}sub'h
(&){@$;}w{w{$h=1;while($h){$h=0;for($c=0;$c<806;$c++){$s2=~/
^.{$c}(.)/sx;my$d=ord($a);$s3=~m[^(.{$c})(.)(.*)]s;($e,$f,$g
)=($a,ord($b),$3);my$h=chr($f!=$d?++$h&&($f>$d?$f-(32->(23->
(3))):$f+(32->(23->(3)))):$f);$s3=$e.$h.$g;}sub'j{o->($s3,$/
)}sub=>j{o->(`$cl`)}}}h{w{$cl='cl'.($^O =~/win/i?'s':'ear');
t{23}h{::8{rand(&*)}};*|=::8{my$s2=&*;$s2=~s/$\///g;(*>,*<)=
&`;my@q=split('',$s2);$i=1;for(my$j=0;$j<=851;$j++){while($i
<793){&>($q[$i]);$i+=(62);$j++;}$i%= 793;}793->(&<);};$s2=f(
60,&|($s2))for 99->(7);*b=\*{2};t{'o'}h{::8{print@_}};}h{*`=
::8{my @x;::8{push@x,&*;},::8{@x}};t{99}h{::8{$,,$,}};t{32}h
{::8{int(&*)}}; t{793}h{::8{join("",@$)}};sub'f{$$[1]if$$[1]
=~s((.{$$[0]}))[$a$/]g;}s&$/&&g;$s2=$$;$s3=f(60,$$);}}}h{s()
*.iotT, hnn   chie i in.a esIco e i.ew r I a f   l  h n     
   iAe e"ie nl ptat n  oe s ked  m n . t o oa e     r t r  m
 eahr- s gier fatcp n lodg me as s onpo e   o e n r  t o . e
   gk v    hyee   h   ss i l in . e o . u r t  k w s f c    
  h Tfy-n uyha iH sm o  hea  feH    rion v " b r a o.   y d 
h   n  e ..sTaM  ep m e'iec u lia. h l"t o h  u l o i   i . 
     " a-i oTte   .no,r epn  rir s s ea k e .       w. o r n
 t   in n .ai"d n huto vr cn p  l . t"erh   t do a n   e d .
  ,     d e r  h ne.ocrt n em eneai i hgr  n . a a h  . t e 
u     hm   ..  -ea t ir 'esne   e .n  obeg t   ey t k d g d 
.  m       v h.d  eh.Cnoc oepe vah      aoI   .     g al   v
 o m s sa y eksmoh   g f Ikiet c ne.i tt ku n n n      r u a
 d  e e       tdnr vTt ite hhph eMwfs e e o  , g . , u  l d 
e f o ' uD a r*};
[download]

Update: Changed to try to detect windows properly.
Update2: Just checked it under AS-Perl, it scrolls instead of clearing. I'll revisit fixing this when I have a working windows box at home again.

P.S. De-obfuscations most welcome;)
-- I'm not a cryptographer, but I play one on TV.