YES!!

%yes
y
y
y (Ctrl+C)
%

yes .... now i will talk about something about "yes" utility...
in linux,, usually located at /usr/bin/, there is a file called "yes"
it utterly does nothing but continues output of "y"

the size of this file is around 19kb (in OpenSUSE 11)
i recommend you try this command... hehe... don't login as root,,

    yes | rm -i *

now,,, i'll talk about making "yes" on windows ....
here is the one purely done in "debug"
>

this yes quits when you press "Q" or "q"
or you can write one by a simply loop

    loop:

          mov dx, offset yes

          mov ah, 9

          int 21h

          jmp loop

    yes db "yes", 0d, 0a, "$"

or in batch file

    @echo off

    REM A yes utility on windows

    REM Zhihua Lai, 07/Dec/2008 5:05am

    REM Free to use, just for fun!

    

    :yes

      echo yes

      goto yes

or if you write a keypressed.com which returns the key to command line...

    @echo off

    REM A yes utility in batch file with keypressed.com

    REM Written by Zhihua Lai, 10-Dec-2008, 2:49

    REM Just For Fun!

    

    :yes

    	echo yes

    	keypressed

    	set key=%errorlevel%

    	if %key% EQU 81 goto eof

    	if %key% EQU 113 goto eof

    	goto yes

    

    :eof

    	set key=

now i am attaching binary files... just for fun!

yes.com (37 Bytes)
yes15b.com (15 Bytes)
keypressed.com (19 Bytes)
You see, they are pretty small.