Here's a better version:

alias rickroll {
  goto end
  msg $1 WERE NO STRANGERS TO LOVE
  msg $1 YOU KNOW THE RULES, AND SO DO I
  msg $1 A FULL COMMITMENTS WHAT IM THINKING OF
  msg $1 YOU WOULDNT GET THIS FROM ANY OTHER GUY
  msg $1 I JUST WANNA TELL YOU HOW IM FEELING
  msg $1 GOTTA MAKE YOU, UNDERSTAND
  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 WEVE KNOWN EACH OTHER, FOR SO LONG
  msg $1 YOUR HEARTSBEEN ACHING, BUT YOUR TOO SHY TO SAY IT
  msg $1 INSIDE WE BOTH KNOW WHATS BEEN GOING ON
  msg $1 WE KNOW THE GAME AND WERE GONNA PLAY IT
  msg $1 AND IF YOU ASK ME HOW IM FEELING
  msg $1 DONT TELL ME YOURE TO, BLIND TO SEE
  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 GIVE YOU UP, GIVE YOU UP
  msg $1 GIVE YOU UP, GIVE YOU UP
  msg $1 NEVER GONNA GIVE
  msg $1 NEVER GONNA GIVE, GIVE YOU UP
  msg $1 NEVER GONNA GIVE
  msg $1 NEVER GONNA GIVE, GIVE YOU UP
  msg $1 I JUST WANNA TELL YOU HOW IM FEELING
  msg $1 GOTTA MAKE YOU, UNDERSTAND
  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 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 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 YOU JUST GOT TEXT-ROLLED!
  :end
  .unload -rs $nopath($script)
}