Here is the script.

on *:TEXT:!8ball*:#:{
/set %8ball $rand(1,6)
if (%8ball == 1) .msg $chan 10No
if (%8ball == 2) .msg $chan 10Yes
if (%8ball == 3) .msg $chan 10Maybe
if (%8ball == 4) .msg $chan 10Of course
if (%8ball == 5) .msg $chan 10Not sure
if (%8ball == 6) /msg $chan 10How should I know?