Mine

on 500:text:!unmimic:#:{ unset %mimic. [ $+ [ $chan ] ] | msg $chan Mimic unset. }
on 500:text:!mimic *:#:{ set %mimic. [ $+ [ $chan ] ] $2 | msg $chan Now mimicing $2 $+ . }
on *:TEXT:*:#:{
  if ($nick == %mimic. [ $+ [ $chan ] ]) { msg $chan $chr(3) $+ $replacex($1-,$me,$nick,$nick,$me,Im $+ $chr(32),you're $+ $chr(32),I'm,You're,i am, you are) }
}
on *:ACTION:*:#:{
  if ($nick == %mimic. [ $+ [ $chan ] ]) { describe $chan $chr(3) $+ $replacex($1-,$me,$nick,$nick,$me,Im $+ $chr(32),you're $+ $chr(32),I'm,You're, I am, you are) }
}