you forgot a closing bracket.

you should space it out an make him look mad

alias bunny {  
  say 12The bunny has a rose, and
  say 04 $str($chr(160),19) ( ) ( )
  say 04 $str($chr(160),19) ( `.´ )
  say 04 $str($chr(160),18) (")_(")
  say $str($chr(160),2) 12THE BUNNY IS PISSED!!
}

<~napa182> The bunny has a rose, and
<~napa182>                     ( ) ( )
<~napa182>                     ( `.´ )
<~napa182>                    (")_(")
<~napa182>    THE BUNNY IS PISSED!!

or better yet

alias bunny {  
  say 04 $str($chr(160),15) ( ) ( )
  say 04 $str($chr(160),10) ,|,_( `.´ )_,|,
  say 04 $str($chr(160),14) (")_(")
  say 12THE BUNNY IS PISSED!!
}

<~napa182>                 ( ) ( )
<~napa182>            ,|,( `.´ ),|,
<~napa182>                (")_(")
<~napa182> THE BUNNY IS PISSED!!