on *:TEXT:!8ball*:#: {
  set %8ball $rand(1,12)
  msg $chan Original question: $2- Answer:
  if(%8ball == 1) { msg $chan No! }
  if(%8ball == 2) { msg $chan Yes! }
  if(%8ball == 3) { msg $chan Of course }
  if(%8ball == 4) { msg $chan Have you gone mad?! I think you have }
  if(%8ball == 5) { msg $chan How should I know? Its not like I'm magic }
  if(%8ball == 6) { msg $chan Heck no! }
  if(%8ball == 7) { msg $chan Maybe... yeah }
  if(%8ball == 1) { msg $chan Why should I tell you? | .timer 1 2 msg $chan BTW don't try and bribe me! }
  if(%8ball == 8) { msg $chan If I say yes will you be quiet? }
  if(%8ball == 9) { msg $chan Yes... that will be 30 dollars }
  if(%8ball == 10) { msg $chan How should I say this? Um... no }
  unset %8ball
}

Why are there so many 8balls on hawkee!!! argh! You should also use var %8ball so you dont need to unset it.
i guess you could try sockets but for purposes of this, you dont need the brackets. so like.

on *:TEXT:!8ball*:#: {
  var %8ball $rand(1,12)
  msg $chan Original question: $2- Answer:
  if %8ball == 1 msg $chan No! 
  if %8ball == 2  msg $chan Yes! 
  if %8ball == 3  msg $chan Of course 
  if %8ball == 4 msg $chan Have you gone mad?! I think you have 
  if %8ball == 5  msg $chan How should I know? Its not like I'm magic 
  if %8ball == 6  msg $chan Heck no! 
  if %8ball == 7 msg $chan Maybe... yeah 
  if %8ball == 1 msg $chan Why should I tell you? | .timer 1 2 msg $chan BTW don't try and bribe me!
  if %8ball == 8 msg $chan If I say yes will you be quiet?
  if %8ball == 9 msg $chan Yes... that will be 30 dollars
  if %8ball == 10 msg $chan How should I say this? Um... no
}

And theres your code improved and 100% working.