#!/usr/bin/perl -w                                # Object Oriented?
use strict;

            package                # a ball?
        ball;my%bal;sub            # is a ball an object?
     new{shift;my@ball=@_;         # maybe... but what if it
   for(my$ball=0;$ball<@ball       # gets lost... how can you
 ;$ball++){if(!$ball<16){$ball     # prove it was there in the
[$ball]=~s+(.{31}).*+$1+x;$,=""    # first place? 
;}$ball[$ball]=~y=a-lmn-zA-Z=x=
if($ball<16);my $b;$ball[$ball]         #
 =~y=!-@[-_{-~=x=; $ball[$ball           ##
   ]=~s+x\sx+xxx+gx if($ball             <16
     );$ball[$ball]=~s+.*+                s!.*
        !!x+sex unless(                   $ball       # a banana?
            <16&& $                        ball>2     # is a banana
                                           );$ball[   # an object?
                                           $ball]=~   # maybe... but
                                          s+1++gx;};  # what if it
                                         print@ball}  # gets eaten..
                                        package main  # how can you
                                       ;;;;open(OUT,  # prove it was
                                      $0 );; my @in;  # there in the
                                     @ in= <OUT> ;;   # first place?
                                   package banana;
                                  ;sub new{shift;
                                 my @banana=@_;;
                               map( y=!-~=x=,@
                             banana);map(s+x
                           s?\sx+xxx+gx, @
                        banana);for (my$
                    banana=10; $banana
                <@banana;$banana++){
             if($banana<37){substr
         ($banana [$banana ]
     ,0, 41-$ banana)=~
   y=!-~= =; ;;

                    $banana[$banana]
                   =~s+(.{53}).*+$1+;                 # a lamp?
                 print $banana[$banana]               # is a lamp
               ;}}}package lamp;;sub new{             # an object?
             my$lamp={}; my@lamp=@_[39..63]           # maybe...
           ;$lamp->{lamp}=[@lamp]; grep (map(         # but what if
         y=!-~=x=, @{$lamp->{lamp}}), @{$lamp->       # it gets
      {lamp}});;; grep(map (s/x\sx/xxx/, @{$lamp->    # turned off?
   {lamp}}),@{$lamp->{lamp}});for(my$lamp1=0; $lamp1< # how can you
   @{$lamp->{lamp}};$lamp1++){substr($lamp->{lamp}->[ # prove it was
   $lamp1],0,15-$lamp)=~y=!-~= = if($lamp>15);$lamp-> # there in the
                   {lamp}->[$lamp1]=~                 # first place?
                   s+(.{53}).*+$1+x ;
                   } bless $lamp;}; ;
                   sub return_data{my
                   $lamp=shift;return
                   @{$lamp->{lamp}};}
                   package main;while
                   (){print ">";$_=<>
                   ;$_= new ball(@in)
                   if(/^ball$/) ;$_ =
                   new banana(@in) if
                   (/^banana$/);if(/^
                   ob(ject)?ive$/x ){
                   my@object=qw/real?


even  anything   Is object?
an really anything  Is/;;$,  # a block?
=" ";print reverse @ object  # is a block an object?
;;print "\n";};if(/^lamp$/)  # maybe... but what if it 
{$_=new lamp(@in);;print($_  # crumbles?  how can you 
->return_data)}if(/^block$/  # prove it was there in the
){my@block=@in;map(y= -~=x=  # first place?
,@block);; for(my$block=65;
$block<$#block+1;$block++){
$block[$block]=~s+(.{27}).*
+$1+x;print$block[$block]}}
exit if(/^exit$/)}close OUT
[download]

This obfu is command driven (meaning you have to type stuff to make it do stuff). The commands are:

1. ball
2. banana
3. lamp
4. block
5. exit
6. and a secret (ok maybe not too secret...) command!

Things to note:

1. Please dl code rather than copy/paste (or if you MUST copy/paste, put a blank line at the end)
2. Either way, please save to a file and run from there.
3. Don't vote just because of the presentation ascii... I think it makes it look cool (and its a lot more work to do) but theres more to this piece than that. Also, I welcome anyone who would like to review/decipher it!

Update: Run the program, and THEN input the commands. It has sort of a mini-shell. Don't try to input the commands with command line flags, because it wont work :)