Now there's probably a million of these out there, so I figured I'd throw another out. This is probably the most basic type of script I could do, but whatever. Here you go... Made by Sam Ferry (me) of IRC.AceIRC.org #datablab.

/rickroll sends it to a channel.
/rickroll PM's it to a user.

Also, there are channel and nicklist menus.

Screenshot Below...

;@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
;@ Simple Rickroll Script For Channels and/or Nicknames (Query) @
;@ By Sam Ferry                                                 @
;@ http://www.samferry.com                                      @
;@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

menu channel {
  -
  Rickroll The Channel:/rickroll #
}
menu nicklist {
  -
  Rickroll This Person:/rickroll $$1
}
alias rickroll {
  if ($1 == $null) {
    echo -a Please supply a nickname or channel.
  }
  else {
    msg $$1 We're no strangers to love
    msg $$1 You know the rules and so do I
    msg $$1 A full commitment's what I'm thinking of
    msg $$1 You wouldn't get this from any other guy
    msg $$1 
    msg $$1 I just wanna tell you how I'm feeling
    msg $$1 Gotta make you understand
    msg $$1 
    msg $$1 Never gonna give you up
    msg $$1 Never gonna let you down
    msg $$1 Never gonna run around and desert you
    msg $$1 Never gonna make you cry
    msg $$1 Never gonna say goodbye
    msg $$1 Never gonna tell a lie and hurt you
    msg $$1 
    msg $$1 We've known each other for so long
    msg $$1 Your heart's been aching, but
    msg $$1 You're too shy to say it
    msg $$1 Inside we both know what's been going on
    msg $$1 We know the game and we're gonna play it
    msg $$1 
    msg $$1 And if you ask me how I'm feeling
    msg $$1 Don't tell me you're too blind to see
    msg $$1 
    msg $$1 Never gonna give you up
    msg $$1 Never gonna let you down
    msg $$1 Never gonna run around and desert you
    msg $$1 Never gonna make you cry
    msg $$1 Never gonna say goodbye
    msg $$1 Never gonna tell a lie and hurt you
    msg $$1 
    msg $$1 Never gonna give you up
    msg $$1 Never gonna let you down
    msg $$1 Never gonna run around and desert you
    msg $$1 Never gonna make you cry
    msg $$1 Never gonna say goodbye
    msg $$1 Never gonna tell a lie and hurt you
    msg $$1 
    msg $$1 (Oooooooh, Give you up)
    msg $$1 (Oooooooh, Give you UP)
    msg $$1 Never gonna give, never gonna give
    msg $$1 (Give you up)
    msg $$1 Never gonna give, never gonna give
    msg $$1 (Give you up)
    msg $$1 
    msg $$1 We've known each other for so long
    msg $$1 Your heart's been aching, but
    msg $$1 You're too shy to say it
    msg $$1 Inside we both know what's been going on
    msg $$1 We know the game and we're gonna play it
    msg $$1 
    msg $$1 I just wanna tell you how I'm feeling
    msg $$1 Gotta make you understand
    msg $$1 
    msg $$1 Never gonna give you up
    msg $$1 Never gonna let you down
    msg $$1 Never gonna run around and desert you
    msg $$1 Never gonna make you cry
    msg $$1 Never gonna say goodbye
    msg $$1 Never gonna tell a lie and hurt you
    msg $$1 
    msg $$1 Never gonna give you up
    msg $$1 Never gonna let you down
    msg $$1 Never gonna run around and desert you
    msg $$1 Never gonna make you cry
    msg $$1 Never gonna say goodbye
    msg $$1 Never gonna tell a lie and hurt you
    msg $$1 
    msg $$1 Never gonna give you up
    msg $$1 Never gonna let you down
    msg $$1 Never gonna run around and desert you
    msg $$1 Never gonna make you cry
    msg $$1 Never gonna say goodbye
    msg $$1 Never gonna tell a lie and hurt you
  }
}